Updated on 2023/11/25

写真a

 
MARU Nobuhito
 
Organization
Graduate School of Science Department of Physics Professor
School of Science Department of Physics
Title
Professor
Affiliation
Institute of Science

Position

  • Graduate School of Science Department of Physics 

    Professor  2022.04 - Now

  • School of Science Department of Physics 

    Professor  2022.04 - Now

Degree

  • Doctor of Science ( Nagoya University )

Research Areas

  • Natural Science / Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics  / 素粒子論、場の量子論

Research Interests

  • 標準模型を超える物理

Professional Memberships

  • THE PHYSICAL SOCIETY OF JAPAN

Committee Memberships (off-campus)

  • 素粒子メダル奨励賞選考委員   日本物理学会  

    2018.01 - 2020.12 

  • -   文部科学省・日本学術振興会等による事業の審査委員会  

    2015.04 - 2016.03 

      More details

    日本学術振興会 科学研究費委員会専門委員

  • 素粒子論委員   日本物理学会  

    2014.04 - 2016.03 

  • -   文部科学省・日本学術振興会等による事業の審査委員会  

    2014.04 - 2015.03 

      More details

    日本学術振興会 特別研究員等審査会専門委員および国際事業委員会書面審査委員

  • 素粒子論領域運営委員   日本物理学会  

    2014.04 - 2015.03 

  • -   文部科学省・日本学術振興会等による事業の審査委員会  

    2013.04 - 2014.03 

      More details

    日本学術振興会 特別研究員等審査会専門委員および国際事業委員会書面審査委員

  • 素粒子論グループ事務局   日本物理学会  

    2011.04 - 2011.09 

▼display all

Awards

  • 日本学術振興会 特別研究員等審査会専門委員(書面担当)表彰

    2015  

  • JSPS「平成26年度特別研究員等審査会専門委員表彰」

    丸 信人

    2015   日本学術振興会  

Job Career (off-campus)

  • Osaka Metropolitan University   NITEP/Department of Physics

    2022.04 - Now

  • Osaka City University   Graduate School of Science

    2013.04 - 2022.03

  • Keio University Faculty of Economics Faculty of Economics, Department of Economics   Assistant Professor (Non-tenured) / Research Associate (Non-tenured) / Instructor (Non-tenured)

    2011.04 - 2013.03

  • 慶應義塾大学 経済学部 日吉物理学教室   -助教(有期)

    2011 - 2013

  • -:順天堂大学 医学部・スポーツ健康科学部 非常勤講師

    2010

  • 中央大学大学院 理工学研究科 物理学専攻   -共同研究員

    2008 - 2011

  • :中央大学 理工学部 物理学科 共同研究員

    2008 - 2011

  • 神戸大学大学院 理学研究科 物理学専攻   -学術研究員

    2006 - 2008

  • :神戸大学 理学部 物理学科 学術研究員

    2006 - 2008

  • ローマ大学 物理学科   -INFN postdoctoral researcher

    2005 - 2006

  • :ローマ大学 物理学科 INFN研究員

    2005 - 2006

  • 理化学研究所   -基礎科学特別研究員

    2003 - 2005

  • :理化学研究所 基礎科学特別研究員

    2003 - 2005

  • 東京大学大学院 理学系研究科 物理学専攻   -学振特別研究員(PD)

    2000 - 2003

  • 東京工業大学大学院 理工学研究科 基礎物理学専攻   -学振特別研究員(PD)

    1999 - 2000

▼display all

Education

  • Nagoya University   The second semester of doctoral program   Graduated/Completed

    - 1999

  • Nagoya University     Graduated/Completed

    - 1994

Papers

  • Cosmological collider signals of non-Gaussianity from higgs boson in GUT Reviewed

    Maru N.

    International Journal of Modern Physics A   38 ( 14 )   2023.05( ISSN:0217751X

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1142/S0217751X23500756

  • Perturbative calculation of supersymmetric gradient flow in N = 1 supersymmetric QCD Reviewed

    Kadoh D.

    Progress of Theoretical and Experimental Physics   2023 ( 1 )   2023.01

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/ptep/ptac165

  • Gauge coupling unification in simplified grand gauge-Higgs unification Reviewed

    Maru N.

    Physical Review D   106 ( 5 )   2022.09( ISSN:24700010

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevD.106.055033

  • On the vacuum structure of gauge–Higgs unification models Reviewed

    Adachi Y.

    Progress of Theoretical and Experimental Physics   2022 ( 9 )   2022.09

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/ptep/ptac107

  • Gauge symmetry breaking in flux compactification with a Wilson-line scalar condensate Reviewed

    Akamatsu K.

    Physical Review D   106 ( 3 )   2022.08( ISSN:24700010

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevD.106.035035

  • Gauge Coupling Unification in simplified Grand Gauge-Higgs Unification Reviewed

    Nobuhito Maru, Haruki Takahashi, Yoshiki Yatagai

    2022.07

     More details

    Publishing type:Research paper (scientific journal)  

    Grand gauge-Higgs unification of five dimensional SU(6) gauge theory on an
    orbifold $S^1/Z_2$ with localized gauge kinetic terms is discussed. The
    Standard model (SM) fermions on the boundaries and some massive bulk fermions
    coupling to the SM fermions on the boundary are introduced. Taking the
    power-law running contributions from the bulk fields into account, perturbative
    gauge coupling unification is shown to be realized at around $10^{14}$ GeV,
    which is a few order smaller than the unification scale of four dimensional
    grand unified theories.

    Other URL: http://arxiv.org/pdf/2207.10253v1

  • Cosmological Collider Signals of Non-Gaussianity from Higgs boson in GUT Reviewed

    Nobuhito Maru, Akira Okawa

    2022.06

     More details

    Publishing type:Research paper (scientific journal)  

    Cosmological Collider Physics provides information on high-energy elementary
    particles by observing the spacetime fluctuations generated by inflation
    through the cosmic microwave background radiation. In other words, it is a
    method to investigate physics on energy scales that cannot be reached by
    terrestrial accelerators by means of precise observations of the universe. In
    this paper, we focus on the case where the GUT scale is close to the energy
    scale of inflation, and calculate the non-Gaussianity due to scalar
    fluctuations produced by the Higgs boson in GUT. The results are found to be
    consistent with the current observed restrictions on non-Gaussianity without a
    drastic fine tuning of parameters, which suggests the existence of Higgs boson
    in GUT.

    Other URL: http://arxiv.org/pdf/2206.06651v1

  • Gauge Symmetry Breaking in Flux Compactification with Wilson-line Scalar Condensate Reviewed

    Kento Akamatsu, Takuya Hirose, Nobuhito Maru

    2022.05

     More details

    Publishing type:Research paper (scientific journal)  

    We discuss the gauge symmetry breaking of six dimensional theories in flux
    compactification with a magnetic flux background and a constant vacuum
    expectation value (VEV) for the scalar fields, which are zero modes of extra
    spatial components of the gauge field. Although the effective potential for the
    scalar fields are known not to be generated classically and radiatively in a
    magnetic flux background only, the one-loop effective potential is shown to be
    generated by the effects of the non-zero constant VEV. As illustrations, we
    calculate the one-loop effective potential in SU(2) and SU(3) Yang-Mills
    theories. In both cases, we find that the potential minimum is located at
    non-zero VEV and the gauge symmetry breaking takes place.

    Other URL: http://arxiv.org/pdf/2205.09320v2

  • Fermion Mass Hierarchy and Mixing in simplified Grand Gauge-Higgs Unification Reviewed

    Nobuhito Maru, Haruki Takahashi, Yoshiki Yatagai

    2022.05

     More details

    Publishing type:Research paper (scientific journal)  

    Grand gauge-Higgs unification of five dimensional SU(6) gauge theory on an
    orbifold $S^1 / Z_2$ with localized gauge kinetic terms is discussed. The
    Standard model (SM) fermions on the boundaries and some massive bulk fermions
    coupling to the SM fermions are introduced. The number of the bulk fermions is
    reduced to realize perturbative gauge coupling unification, which could not be
    done in the previous model. Although this reduction will lead to the additional
    generation mixings in the bulk which makes our analysis more complicated and
    nontrivial, the generation mixing of the SM fermions is reproduced in addition
    to the SM fermion mass hierarchy by mild tuning the bulk masses and parameters
    of the localized gauge kinetic terms.

    Other URL: http://arxiv.org/pdf/2205.05824v1

  • On the vacuum structure of gauge-Higgs unification models Reviewed

    Yuki Adachi, C. S. Lim, Nobuhito Maru

    2022.04

     More details

    Publishing type:Research paper (scientific journal)  

    In this paper, we discuss the vacuum structure of the gauge-Higgs unification
    theory, which is one of the attractive candidates of physics beyond the
    standard model. This scenario has a remarkable feature, namely it has
    infinitely degenerate vacua due to the characteristic periodic potential of the
    Higgs filed, to be identified with the extra space component of the higher
    dimensional gauge field. We address a question, whether to form the
    superposition of such degenerate vacua, like the $\theta$-vacuum in QCD, is
    necessary or not, in order to realize the true vacuum state of the theory. We
    derive gauge field configuration which describes the transition between
    neighboring vacua, like the instanton (or anti-instanton) solution in QCD, and
    the corresponding Euclidean action in two models. In a simplified 2-dimensional
    U(1) model, the derived configuration to describe the transition is shown to
    have finite Euclidean action, and accordingly the "$\theta$-vacuum" and the
    resultant "$\theta$-term" are formulated. In a realistic 5D U(1) model,
    however, the gauge field configuration to describe the transition is shown to
    have infinite Euclidean action and therefore the tunneling probability between
    the degenerate vacua vanishes. Thus the superposition of the degenerate vacua
    is not necessary.

    Other URL: http://arxiv.org/pdf/2205.00161v1

  • Extranatural flux inflation Reviewed

    Hirose Takuya, Maru Nobuhito

    JOURNAL OF HIGH ENERGY PHYSICS   ( 9 )   2021.09( ISSN:1029-8479

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/JHEP09(2021)124

  • The strong CP problem and higher dimensional gauge theories Reviewed

    Yuki Adachi, C. S. Lim, Nobuhito Maru

    2022 ( 5 )   2021.08

     More details

    Publishing type:Research paper (scientific journal)  

    We discuss a natural scenario to solve the strong CP problem in the framework
    of the higher dimensional gauge theory. An axion-like field $A_y$ has been
    built-in as the extra-space component of the higher dimensional gauge field.
    The coupling of $A_y$ with gluons is attributed to the radiatively induced
    "Chern-Simons" (CS) term. We adopt a toy model with some unknown gauge symmetry
    U(1)$_X$. The CS term is obtained in two ways: first by a concrete 1-loop
    calculation and next by use of the Fujikawa's method to deal with the chiral
    anomaly in 4D space-time. The obtained results are identical, which implies
    that the radiative correction to the CS term is "1-loop exact" and is also free
    from UV-divergence even though the theory itself is non-renormalizable. As a
    novel feature of this scenario, such obtained CS term is no longer linear in
    the field $A_y$ as in the usually discussed CS term in 5D space-time but a
    periodic function of $A_y$, since $A_y$ has a physical meaning as the
    Wilson-loop phase. We argue how such novel feature of this scenario causes the
    modification of the ordinary solutions of the strong CP problem based on the
    axion fields.

    DOI: 10.1093/ptep/ptac070

    Other URL: http://arxiv.org/pdf/2108.07367v1

  • Nonvanishing finite scalar mass in flux compactification Reviewed

    Hirose Takuya, Maru Nobuhito

    JOURNAL OF HIGH ENERGY PHYSICS   ( 6 )   2021.06( ISSN:1029-8479

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/JHEP06(2021)159

  • Extranatural Flux Inflation Reviewed

    Takuya Hirose, Nobuhito Maru

    2021 ( 9 )   2021.05

     More details

    Publishing type:Research paper (scientific journal)  

    We propose a new inflation scenario in flux compactification, where a zero
    mode scalar field of extra components of the higher dimensional gauge field is
    identified with an inflaton. The scalar field is a pseudo Nambu-Goldstone boson
    of spontaneously broken translational symmetry in compactified spaces. The
    inflaton potential is non-local and finite, which is protected against the
    higher dimensional non-derivative local operators by quantum gravity
    corrections thanks to the gauge symmetry in higher dimensions and the shift
    symmetry originated from the translation in extra spaces. We give an explicit
    inflation model in a six dimensional scalar QED, which is shown to be
    consistent with Planck 2018 data.

    DOI: 10.1007/JHEP09(2021)124

    Other URL: http://arxiv.org/pdf/2105.11782v2

  • Cancellation of one-loop corrections to scalar masses in flux compactification with higher dimensional operators Reviewed

    Hirose Takuya, Maru Nobuhito

    JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS   48 ( 5 )   2021.05( ISSN:0954-3899

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/1361-6471/abddce

  • Nonvanishing Finite Scalar Mass in Flux Compactification Reviewed

    Takuya Hirose, Nobuhito Maru

    2021 ( 6 )   2021.04

     More details

    Publishing type:Research paper (scientific journal)  

    We study possibilities to realize a nonvanishing finite Wilson line (WL)
    scalar mass in flux compactification. Generalizing loop integrals in the
    quantum correction to WL mass at one-loop, we derive the conditions for the
    loop integrals and mode sums in one-loop corrections to WL scalar mass to be
    finite. We further guess and classify the four-point and three-point
    interaction terms satisfying these conditions. As an illustration, the
    nonvanishing finite WL scalar mass is explicitly shown in a six dimensional
    scalar QED by diagrammatic computation and effective potential analysis. This
    is the first example of finite WL scalar mass in flux compactification.

    DOI: 10.1007/JHEP06(2021)159

    Other URL: http://arxiv.org/pdf/2104.01779v2

  • Non-Gaussianity from $X, Y$ gauge bosons in Cosmological Collider Physics Reviewed

    Nobuhito Maru, Akira Okawa

    2021.01

     More details

    Publishing type:Research paper (scientific journal)  

    Heavy fields of Hubble scale order present during inflation contribute to the
    non-Gaussian signature for the three-point function of the inflaton. Taking
    into account that Hubble scale is around the scale of grand unified theory
    (GUT), this opens a possibility that the GUT scale signatures, which are very
    hard to be discovered at collider, might be detectable by using information
    from the precise observations of cosmic microwave background. We discuss a
    detactability of the $X, Y$ gauge boson present in any GUT in a framework of
    cosmological collider physics. Calculating one-loop contributions of $X, Y$
    gauge bosons to the inflaton three-point functions, we find a remarkable result
    that one-loop diagram with interactions originated from the mass terms of $X,
    Y$ gauge bosons provides an enhancement factor expressed by the ratio between
    the $X, Y$ gauge boson mass and Hubble scale as $(m_X/H)^4$. In an estimation
    of the non-Gaussianity, this factor is crucial and its impact on the
    detactability of $X, Y$ gauge bosons is discussed.

    Other URL: http://arxiv.org/pdf/2101.10634v1

  • Cancellation of One-loop Corrections to Scalar Masses in Flux Compactification with Higher Dimensional Operators Reviewed

    Takuya Hirose, Nobuhito Maru

    48 ( 5 )   2020.12( ISSN:09543899

     More details

    Publishing type:Research paper (scientific journal)  

    We further study the cancellation of the one-loop corrections to the scalar
    mass in a six dimensional SU(2) gauge theory with higher dimensional operators,
    which is compactified on a torus with magnetic flux. Higher dimensional
    operators also contribute to the corrections to the scalar mass nontrivially.
    We explicitly show by the diagrammatic calculations that the corrections are
    exactly cancelled even with the leading terms of the higher dimensional
    operators.

    DOI: 10.1088/1361-6471/abddce

    Other URL: http://arxiv.org/pdf/2012.03494v1

  • Improving fermion mass hierarchy in grand gauge-Higgs unification with localized gauge kinetic terms Reviewed

    Maru Nobuhito, Yatagai Yoshiki

    EUROPEAN PHYSICAL JOURNAL C   80 ( 10 )   2020.10( ISSN:1434-6044

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1140/epjc/s10052-020-08485-8

  • Strong first order electroweak phase transition in gauge-Higgs unification at finite temperature Reviewed

    Adachi Yuki, Maru Nobuhito

    PHYSICAL REVIEW D   101 ( 3 )   2020.02( ISSN:2470-0010

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevD.101.036013

  • Cancellation of one-loop corrections to scalar masses in flux compactification with higher dimensional operators Reviewed

    丸 信人

    Journal of Physics G   -   2020

     More details

    Publishing type:Research paper (scientific journal)  

  • Strong First Order Electroweak Phase Transition in Gauge-Higgs Unification at Finite Temperature Reviewed

    Yuki Adachi, Nobuhito Maru

    101 ( 3 )   2019.11( ISSN:24700010

     More details

    Publishing type:Research paper (scientific journal)  

    We analyze the electroweak phase transition at finite temperature in a model
    of gauge-Higgs unification where the fermion mass hierarchy including top quark
    mass, a viable electroweak symmetry breaking and an observed Higgs mass are
    successfully reproduced. To study the phase transition, we derive the general
    formula of the 1-loop effective potential at finite temperature by using the
    $\zeta$ function regularization method. It is remarkable that the functions
    determining the Kaluza-Klein mass spectrum have only to be necessary in
    calculations. This potential can be applicable to any higher dimensional theory
    in flat space where one extra spatial dimension is compactified. Applying to
    our model of gauge-Higgs unification, the strong first phase transition
    compatible with 125 GeV Higgs mass is found to happen.

    DOI: 10.1103/PhysRevD.101.036013

    Other URL: http://arxiv.org/pdf/1911.05963v1

  • Improving Fermion Mass Hierarchy in Grand Gauge-Higgs Unification with Localized Gauge Kinetic Terms Reviewed

    Nobuhito Maru, Yoshiki Yatagai

    80 ( 10 )   2019.11( ISSN:14346044

     More details

    Publishing type:Research paper (scientific journal)  

    Grand gauge-Higgs unification of five dimensional SU(6) gauge theory on an
    orbifold S^1/Z_2 with localized gauge kinetic terms is discussed. The Standard
    model (SM) fermions on one of the boundaries and some massive bulk fermions
    coupling to the SM fermions on the boundary are introduced, so that they
    respect an SU(5) symmetry structure. The SM fermion masses including top quark
    are reproduced by mild tuning the bulk masses and parameters of the localized
    gauge kinetic terms. Gauge coupling universality is not guaranteed by the
    presence of the localized gauge kinetic terms and it severely constrains the
    Higgs vacuum expectation value. Higgs potential analysis shows that the
    electroweak symmetry breaking occurs by introducing additional bulk fermions in
    simplified representations.The localized gauge kinetic terms enhance the
    magnitude of the compactification scale, which helps Higgs boson mass large.
    Indeed the observed Higgs boson mass 125 GeV is obtained.

    DOI: 10.1140/epjc/s10052-020-08485-8

    Other URL: http://arxiv.org/pdf/1911.03465v3

  • Cancellation of one-loop corrections to scalar masses in Yang-Mills theory with flux compactification Reviewed

    Hirose Takuya, Maru Nobuhito

    JOURNAL OF HIGH ENERGY PHYSICS   ( 8 )   2019.08( ISSN:1029-8479

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/JHEP08(2019)054

  • Fermion mass hierarchy in grand gauge-Higgs unification Reviewed

    Maru Nobuhito, Yatagai Yoshiki

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   ( 8 )   2019.08( ISSN:2050-3911

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/ptep/ptz083

  • Cancellation of One-loop Corrections to Scalar Masses in Yang-Mills Theory with Flux Compactification Reviewed

    Takuya Hirose, Nobuhito Maru

    2019 ( 8 )   2019.04( ISSN:11266708

     More details

    Publishing type:Research paper (scientific journal)  

    We calculate one-loop corrections to the mass for the zero mode of scalar
    field in a six-dimensional Yang-Mills theory compactified on a torus with
    magnetic flux. It is shown that these corrections are exactly cancelled thanks
    to a shift symmetry under the translation in extra spaces. This result is
    expected from the fact that the zero mode of scalar field is a Nambu-Goldstone
    boson of the translational invariance in extra spaces.

    DOI: 10.1007/JHEP08(2019)054

    Other URL: http://arxiv.org/pdf/1904.06028v1

  • Fermion Mass Hierarchy in Grand Gauge-Higgs Unification Reviewed

    Nobuhito Maru, Yoshiki Yatagai

    2019 ( 8 )   2019.03

     More details

    Publishing type:Research paper (scientific journal)  

    Grand gauge-Higgs unification of five dimensional $SU(6)$ gauge theory on an
    orbifold $S^1/Z_2$ is discussed. The Standard model (SM) fermions are
    introduced on one of the boundaries and some massive bulk fields are also
    introduced so that they couple to the SM fermions through the mass terms on the
    boundary. Integrating out the bulk fields generates the SM fermion masses with
    exponentially small bulk mass dependences. The SM fermion masses except for top
    quark are shown to be reproduced by mild tuning the bulk masses. One-loop Higgs
    potential is calculated and it is shown that the electroweak symmetry breaking
    occurs by introducing additional bulk fields. Higgs boson mass is also
    computed.

    DOI: 10.1093/ptep/ptz083

    Other URL: http://arxiv.org/pdf/1903.08359v2

  • Fermion mass hierarchy in grand Gauge-Higgs unification Reviewed

    Yatagai Yoshiki, Maru Nobuhito

    Meeting Abstracts of the Physical Society of Japan   74.1 ( 0 )   10 - 10   2019

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.11316/jpsgaiyo.74.1.0_10

    CiNii Article

  • $SU(2)_L$ Doublet Vector Dark Matter from Gauge-Higgs Unification Reviewed

    Nobuhito Maru, Nobuchika Okada, Satomi Okada

    Phys. Rev. D 98, 075021 (2018)   98 ( 7 )   2018.10( ISSN:2470-0010

     More details

    Publishing type:Research paper (scientific journal)  

    A new vector dark matter (DM) scenario in the context of the gauge-Higgs
    unification (GHU) is proposed. The DM particle is identified with an
    electric-charge neutral component in an $SU(2)_L$ doublet vector field with the
    same quantum number as the Standard Model Higgs doublet. Since such an
    $SU(2)_L$ doublet vector field is incorporated in any models of the GHU
    scenario, it is always a primary and model-independent candidate for the DM in
    the scenario. The observed relic density is reproduced through a DM pair
    annihilations into the weak gauge bosons with a TeV-scale DM mass, which is
    nothing but the compactification scale of extra-dimensions. Due to the
    higher-dimensional gauge structure of the GHU scenario, a pair of the DM
    particles has no direct coupling with a single $Z$-boson/Higgs boson, so that
    the DM particle evades the severe constraint from the current direct DM search
    experiments.

    DOI: 10.1103/PhysRevD.98.075021

  • SU(2)<sub>L</sub> Doublet Vector Dark Matter from Gauge-Higgs Unification Reviewed

    Maru Nobuhito, Okada Nobuchika, Okada Satomi

    The Physical Society of Japan, Meeting Abstracts of the Physical Society of Japan   73 ( 0 )   18 - 18   2018

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.11316/jpsgaiyo.73.2.0_18

    CiNii Article

  • SU(2)<sub>L</sub> Doublet Vector Dark Matter from Gauge-Higgs Unification Reviewed

    Maru Nobuhito, Okada Nobuchika, Okada Satomi

    Meeting Abstracts of the Physical Society of Japan   73.2 ( 0 )   18 - 18   2018

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.11316/jpsgaiyo.73.2.0_18

    CiNii Article

  • Higgs mass in D-term triggered dynamical SUSY breaking Reviewed

    Maru Nobuhito

    INTERNATIONAL JOURNAL OF MODERN PHYSICS A   32 ( 36 )   2017.12( ISSN:0217-751X

     More details

    Publishing type:Research paper (scientific journal)   Kind of work:Single Work  

    DOI: 10.1142/S0217751X17470200

  • Fermionic Minimal Dark Matter in 5D Gauge-Higgs Unification Reviewed

    Nobuhito Maru, Nobuchika Okada, Satomi Okada

    Phys. Rev. D 96, 115023 (2017)   96 ( 11 )   2017.12( ISSN:2470-0010

     More details

    Publishing type:Research paper (scientific journal)  

    We propose a Minimal Dark Matter (MDM) scenario in the context of a simple
    gauge-Higgs Unification (GHU) model based on the gauge group SU(3) x U(1)' in
    5-dimensional Minkowski space with a compactification of the 5th dimension on
    S^1/Z_2 orbifold. A pair of vector-like SU(3) multiplet fermions in a
    higher-dimensional representation is introduced in the bulk, and the DM
    particle is identified with the lightest mass eigenstate among the components
    in the multiplets. In the original model description, the DM particle
    communicates with the Standard Model (SM) particles only through the bulk gauge
    interaction, and hence our model is the GHU version of the MDM scenario. There
    are two typical realizations of the DM particle in 4-dimensional effective
    theory: (i) the DM particle is mostly composed of the SM SU(2)_L multiplets, or
    (ii) the DM is mostly composed of the SM SU(2)_L singlets. Since the case (i)
    is very similar to the original MDM scenario, we focus on the case (ii), which
    is a realization of the Higgs-portal DM scenario in the context of the GHU
    model. We identify an allowed parameter region to be consistent with the
    current experimental constraints, which will be fully covered by the direct
    dark matter detection experiments in the near future. In the presence of the
    bulk multiplet fermions in higher-dimensional $SU(3)$ representations, we
    reproduce the 125 GeV Higgs boson mass through the renormalization group
    evolution of Higgs quartic coupling with the compactification scale of 10-100
    TeV.

    DOI: 10.1103/PhysRevD.96.115023

  • Fermion Dark Matter in Gauge-Higgs Unification Reviewed

    Nobuhito Maru, Takashi Miyaji, Nobuchika Okada, Satomi Okada

    Phys. Rev. D 96, 115023 (2017)   ( 7 )   2017.07( ISSN:1029-8479

     More details

    Publishing type:Research paper (scientific journal)  

    We propose a Majorana fermion dark matter in the context of a simple
    gauge-Higgs Unification (GHU) scenario based on the gauge group $SU(3)$ x
    $U(1)'$ in 5-dimensional Minkowski space with a compactification of the 5th
    dimension on $S^1/Z_2$ orbifold. The dark matter particle is identified with
    the lightest mode in $SU(3)$ triplet fermions additionally introduced in the
    5-dimensional bulk. We find an allowed parameter region for the dark matter
    mass around a half of the Standard Model Higgs boson mass, which is consistent
    with the observed dark matter density and the constraint from the LUX 2016
    result for the direct dark matter search. The entire allowed region will be
    covered by, for example, the LUX-ZEPLIN dark matter experiment in the near
    future. We also show that in the presence of the bulk $SU(3)$ triplet fermions
    the 125 GeV Higgs boson mass is reproduced through the renormalization group
    evolution of Higgs quartic coupling with the compactification scale of around
    $10^8$ GeV.

    DOI: 10.1007/JHEP07(2017)048

  • Anomalous Higgs Yukawa Couplings and Recent LHC Data Reviewed

    Das Arindam, Maru Nobuhito, Okada Nobuchika

    The Physical Society of Japan, Meeting Abstracts of the Physical Society of Japan   72 ( 0 )   24 - 24   2017

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.11316/jpsgaiyo.72.2.0_24

    CiNii Article

  • Anomalous Higgs Yukawa Couplings and Recent LHC Data Reviewed

    Das Arindam, Maru Nobuhito, Okada Nobuchika

    Meeting Abstracts of the Physical Society of Japan   72.2 ( 0 )   24 - 24   2017

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.11316/jpsgaiyo.72.2.0_24

    CiNii Article

  • Trilinear gauge boson couplings in the gauge-Higgs unification Reviewed

    Yuki Adachi, Nobuhito Maru

    ( 7 )   2016.07( ISSN:2050-3911

     More details

    Publishing type:Research paper (scientific journal)  

    We examine trilinear gauge boson couplings (TGCs) in the context of the
    $SU(3)_W\otimes U(1)'$ gauge-Higgs unification scenario. The TGCs play
    important roles in the probes of the physics beyond the standard model, since
    they are highly restricted by the experiments. We discuss mass spectrum of the
    neutral gauge boson with brane-localized mass terms carefully and find that the
    TGCs and $\rho$ parameter may deviate from standard model predictions. Finally
    we put a constraint from these observables and discuss the possible parameter
    space.

    DOI: 10.1093/ptep/ptw088

  • Nambu-Jona-Lasinio Theory and Dynamical Breaking of Supersymmetry Reviewed

    Nobuhito Maru

    ( 6 )   2016.06( ISSN:2050-3911

     More details

    Publishing type:Research paper (scientific journal)   Kind of work:Single Work  

    A recently proposed new mechanism of D-term triggered dynamical supersymmetry
    breaking is reviewed. Supersymmetry is dynamically broken by nonvanishing
    D-term vacuum expectation value, which is realized as a nontrivial solution of
    the gap equation in the self-consistent approximation as in the case of
    Nambu-Jona-Lasinio model and BCS superconductivity.

    DOI: 10.1093/ptep/ptw018

  • Deviation of Yukawa coupling in gauge-Higgs unification Reviewed

    Adachi Yuki, Maru Nobuhito

    EUROPEAN PHYSICAL JOURNAL PLUS   130 ( 8 )   2015.08( ISSN:2190-5444

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1140/epjp/i2015-15168-3

  • Is the 126 GeV Higgs Boson Mass Calculable in Gauge-Higgs Unification? Reviewed

    C. S. Lim, Nobuhito Maru, Takashi Miura

    ( 4 )   2015.04( ISSN:2050-3911

     More details

    Publishing type:Research paper (scientific journal)  

    We address a question whether the recently observed Higgs mass $M_{H} = 126$
    GeV, of the order of the weak scale $M_{W}$, is calculable as a finite value in
    the scnenario of gauge-Higgs unification. In the scenario formulated on a flat
    5-dimensional space-time, the Higgs mass is calculable, being protected under
    the quantum correction by gauge invariance, though the predicted Higgs mass is
    generally too small compared with $M_{W}$. In the 6-dimensional SU(3) model,
    however, a suitable orbifolding is known to lead to a mass of the order of
    $M_{W}$: $M_{H} = 2M_{W}$ at the tree level, which has some similarity to the
    corresponding prediction by the MSSM, $M_{H}$ leq (cos beta) $M_{Z}$. We
    demonstrate first by a general argument and secondly by explicit calculations
    that, even though the quantum correction to the quartic self-coupling of the
    Higgs field is UV-divergent, its deviation from that of $g^{2}$ is calculable,
    and therefore two observables, $M_{H}^{2}$ and Delta equiv
    $(M_{H}/2M_{W})^{2}-1$, are both calculable in the gauge-Higgs unification
    scenario. The implication of the precise value 126 GeV to the compactification
    scale and the bulk mass of the matter field in our model is also discussed.

    DOI: 10.1093/ptep/ptv030

  • 126 GeV Higgs Boson Associated with D-term Triggered Dynamical Supersymmetry Breaking Reviewed

    Itoyama Hiroshi, Maru Nobuhito

    SYMMETRY-BASEL   7 ( 1 )   193 - 205   2015.03( ISSN:2073-8994

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.3390/sym7010193

  • H to Z gamma in Gauge-Higgs Unification Reviewed

    Nobuhito Maru, Nobuchika Okada

    88 ( 3 )   2013.08( ISSN:1550-7998

     More details

    Publishing type:Research paper (scientific journal)  

    In our previous paper, we have investigated effects of a simple gauge-Higgs
    unification model on the diphoton signal events from the Higgs boson production
    at the Large Hadron Collider. We have found that in this model the effective
    Higgs-to-diphoton coupling can be enhanced by 1-loop corrections with
    Kaluza-Klein (KK) modes of bulk fields. This result can be an explanation for
    the observed excess of the signal strength in the Higgs to diphoton decay
    channel. In this paper, we investigate KK-mode effects on another Higgs boson
    decay mode, H to Z gamma. One naturally expects that the KK modes also
    contribute to the effective H-Z-gamma coupling and can cause some deviation for
    the H to Z gamma decay mode from the Standard Model prediction. Revealing a
    correlation between the KK-mode effects on the Higgs-to-diphoton and H-Z-gamma
    couplings is an interesting topic in terms of a possibility to discriminate a
    variety of models for physics beyond the Standard Model. We show a very
    striking result for the gauge-Higgs unification model, namely, the absence of
    KK-mode contributions to the H-Z-gamma coupling at the 1-loop level. This is a
    very specific and general prediction of the gauge-Higgs unification scenario.

    DOI: 10.1103/PhysRevD.88.037701

  • D-term Triggered Dynamical Supersymmetry Breaking Reviewed

    H. Itoyama, Nobuhito Maru

    88 ( 2 )   2013.07( ISSN:1550-7998

     More details

    Publishing type:Research paper (scientific journal)  

    We present the mechanism of the dynamical supersymmetry breaking at the
    metastable vacuum recently uncovered in the N=1 U(N) supersymmetric gauge
    theory that contains adjoint superfields and that is specified by Kahler and
    non-canonical gauge kinetic functions and a superpotential whose tree vacua
    preserve N=1 supersymmetry. The overall U(1) serves as the hidden sector and no
    messenger superfield is required. The dynamical supersymmetry breaking is
    triggered by the non-vanishing D term coupled to the observable sector, and is
    realized by the self-consistent Hartree-Fock approximation of the NJL type
    while it eventually brings us the non-vanishing F term as well. It is shown
    that theoretical analysis is resolved as a variational problem of the effective
    potential for three kinds of background fields, namely, the complex scalar, and
    the two order parameters D and F of supersymmetry, the last one being treated
    perturbatively. We determine the stationary point and numerically check the
    consistency of such treatment as well as the local stability of the scalar
    potential. The coupling to the N = 1 supergravity is given and the gravitino
    mass formula is derived.

    DOI: 10.1103/PhysRevD.88.025012

  • 20pSE-7 D-Term Triggered Dynamical Supersymmetry Breaking Reviewed

    Itoyama H., Maru N.

    Meeting Abstracts of the Physical Society of Japan   68.2.1 ( 0 )   4   2013

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.11316/jpsgaiyo.68.2.1.0_4_4

    CiNii Article

  • Direct Gauge Mediation of Uplifted Metastable Supersymmetry Breaking in Supergravity Reviewed

    Soryushiron Kenkyu Electronics   119 ( 3 )   C33   2011

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.24532/soken.119.3_C33

    CiNii Article

  • Flavor mixing in gauge-Higgs unification Reviewed

    Yuki Adachi, Nobuaki Kurahashi, C. S. Lim, Nobuhito Maru

    SPRINGER JOURNAL OF HIGH ENERGY PHYSICS   ( 11 )   2010.11( ISSN:1029-8479

     More details

    Publishing type:Research paper (scientific journal)  

    We discuss flavor mixing and resultant flavor changing neutral current rocesses in the SU(3) circle times SU(3)(color) gauge-Higgs unification scenario. To achieve flavor violation is a challenging issue in the scenario, since the Yukawa couplings are originally higher dimensional gauge interactions. We argue that the presence of Z(2)-odd bulk masses of fermions plays a crucial role as the new source of flavor violation. Although introducing brane-localized mass terms in addition to the bulk masses is necessary to realize flavor mixing, if the bulk masses were universal among generations, the flavor mixing and flavor changing neutral current processes are known to disappear. We also discuss whether natural flavor conservation is realized in the scenario. It is shown that the new source of flavor violation leads to flavor changing neutral current processes at the tree level due to the exchange of non-zero Kaluza-Klein gauge bosons. As a typical example we calculate the rate of K-0 - (K) over bar (0) mixing due to the non-zero Kaluza-Klein gluon exchange at the tree level. The obtained result for the mass difference of neutral kaon is suppressed by the inverse powers of the compactification scale. By comparing our prediction with the data we obtain the lower bound of the compactification scale as a function of one unfixed parameter of the theory, which is of O(10) TeV, except for some extreme cases. We argue that the reason to get such rather mild lower bound is the presence of "GIM-like" mechanism, which is a genuine feature of GHU scenario.

    DOI: 10.1007/JHEP11(2010)150

  • Flavor mixing in gauge-Higgs unification Reviewed

    Yuki Adachi, Nobuaki Kurahashi, C. S. Lim, Nobuhito Maru

    JOURNAL OF HIGH ENERGY PHYSICS   ( 11 )   2010.11( ISSN:1029-8479

     More details

    Publishing type:Research paper (scientific journal)  

    We discuss flavor mixing and resultant flavor changing neutral current rocesses in the SU(3) circle times SU(3)(color) gauge-Higgs unification scenario. To achieve flavor violation is a challenging issue in the scenario, since the Yukawa couplings are originally higher dimensional gauge interactions. We argue that the presence of Z(2)-odd bulk masses of fermions plays a crucial role as the new source of flavor violation. Although introducing brane-localized mass terms in addition to the bulk masses is necessary to realize flavor mixing, if the bulk masses were universal among generations, the flavor mixing and flavor changing neutral current processes are known to disappear. We also discuss whether natural flavor conservation is realized in the scenario. It is shown that the new source of flavor violation leads to flavor changing neutral current processes at the tree level due to the exchange of non-zero Kaluza-Klein gauge bosons. As a typical example we calculate the rate of K-0 - (K) over bar (0) mixing due to the non-zero Kaluza-Klein gluon exchange at the tree level. The obtained result for the mass difference of neutral kaon is suppressed by the inverse powers of the compactification scale. By comparing our prediction with the data we obtain the lower bound of the compactification scale as a function of one unfixed parameter of the theory, which is of O(10) TeV, except for some extreme cases. We argue that the reason to get such rather mild lower bound is the presence of "GIM-like" mechanism, which is a genuine feature of GHU scenario.

    DOI: 10.1007/JHEP11(2010)150

    Other URL: http://arxiv.org/pdf/1005.2455v4

  • CP violation due to compactification Reviewed

    C. S. Lim, Nobuhito Maru, Kenji Nishiwaki

    Physical Review D - Particles, Fields, Gravitation and Cosmology   81 ( 7 )   2010.04( ISSN:1550-7998

     More details

    Publishing type:Research paper (scientific journal)  

    We address the challenging issue of how CP violation is realized in higher dimensional gauge theories without higher dimensional elementary scalar fields. In such theories interactions are basically governed by a gauge principle and therefore to get CP violating phases is a nontrivial task. It is demonstrated that CP violation is achieved as the result of compactification of extra dimensions, which is incompatible with the 4-dimensional CP transformation. As a simple example we adopt a 6-dimensional U(1) model compactified on a 2-dimensional orbifold T2/Z4. We argue that the 4-dimensional CP transformation is related to the complex structure of the extra space and show how the Z4 orbifolding leads to CP violation. We confirm by explicit calculation of the interaction vertices that CP violating phases remain even after the rephasing of relevant fields. For completeness, we derive a rephasing invariant CP violating quantity, following a similar argument in the Kobayashi-Maskawa model which led to the Jarlskog parameter. As an example of a CP violating observable we briefly comment on the electric dipole moment of the electron. © 2010 The American Physical Society.

    DOI: 10.1103/PhysRevD.81.076006

  • CP violation due to compactification Reviewed

    C. S. Lim, Nobuhito Maru, Kenji Nishiwaki

    Physical Review D - Particles, Fields, Gravitation and Cosmology   81 ( 7 )   2010.04( ISSN:1550-7998

     More details

    Publishing type:Research paper (scientific journal)  

    We address the challenging issue of how CP violation is realized in higher dimensional gauge theories without higher dimensional elementary scalar fields. In such theories interactions are basically governed by a gauge principle and therefore to get CP violating phases is a nontrivial task. It is demonstrated that CP violation is achieved as the result of compactification of extra dimensions, which is incompatible with the 4-dimensional CP transformation. As a simple example we adopt a 6-dimensional U(1) model compactified on a 2-dimensional orbifold T2/Z4. We argue that the 4-dimensional CP transformation is related to the complex structure of the extra space and show how the Z4 orbifolding leads to CP violation. We confirm by explicit calculation of the interaction vertices that CP violating phases remain even after the rephasing of relevant fields. For completeness, we derive a rephasing invariant CP violating quantity, following a similar argument in the Kobayashi-Maskawa model which led to the Jarlskog parameter. As an example of a CP violating observable we briefly comment on the electric dipole moment of the electron. © 2010 The American Physical Society.

    DOI: 10.1103/PhysRevD.81.076006

  • CP-violation in higher dimensional gauge theory from the complex structure of extra dimensions Reviewed

    Lim C. S., Maru Nobuhito, Nishiwaki Kenji

    Soryushiron Kenkyu Electronics   117 ( 6 )   F58   2010

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.24532/soken.117.6_F58

    CiNii Article

  • Meson-Nucleon Coupling from AdS/QCD Reviewed

    Soryushiron Kenkyu Electronics   117 ( 6 )   F84   2010

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.24532/soken.117.6_F84

    CiNii Article

  • Neutron electric dipole moment in the gauge-higgs unification Reviewed

    Yuki Adachi, C. S. Lim, Nobuhito Maru

    Physical Review D - Particles, Fields, Gravitation and Cosmology   80 ( 5 )   2009.09( ISSN:1550-7998

     More details

    Publishing type:Research paper (scientific journal)  

    We study the neutron electric dipole moment (EDM) in a five-dimensional SU(3) gauge-Higgs unification compactified on M4×S1/Z2 space-time including a massive fermion. We point out that to realize the CP violation is a nontrivial task in the gauge-Higgs unification scenario and argue how the CP symmetry is broken spontaneously by the vacuum expectation value of the Higgs, the extra space component of the gauge field. We emphasize the importance of the interplay between the vacuum expectation value of the Higgs and the Z2-odd bulk mass term to get physically the CP violation. We then calculate the one-loop contributions to the neutron EDM as the typical example of the CP violating observable and find that the EDM appears already at the one-loop level, without invoking the three-generation scheme. We then derive a lower bound for the compactification scale, which is around 2.6 TeV, by comparing the contribution due to the nonzero Kaluza-Klein modes with the experimental data. © 2009 The American Physical Society.

    DOI: 10.1103/PhysRevD.80.055025

  • Neutron electric dipole moment in the gauge-higgs unification Reviewed

    Yuki Adachi, C. S. Lim, Nobuhito Maru

    Physical Review D - Particles, Fields, Gravitation and Cosmology   80 ( 5 )   2009.09( ISSN:1550-7998

     More details

    Publishing type:Research paper (scientific journal)  

    We study the neutron electric dipole moment (EDM) in a five-dimensional SU(3) gauge-Higgs unification compactified on M4×S1/Z2 space-time including a massive fermion. We point out that to realize the CP violation is a nontrivial task in the gauge-Higgs unification scenario and argue how the CP symmetry is broken spontaneously by the vacuum expectation value of the Higgs, the extra space component of the gauge field. We emphasize the importance of the interplay between the vacuum expectation value of the Higgs and the Z2-odd bulk mass term to get physically the CP violation. We then calculate the one-loop contributions to the neutron EDM as the typical example of the CP violating observable and find that the EDM appears already at the one-loop level, without invoking the three-generation scheme. We then derive a lower bound for the compactification scale, which is around 2.6 TeV, by comparing the contribution due to the nonzero Kaluza-Klein modes with the experimental data. © 2009 The American Physical Society.

    DOI: 10.1103/PhysRevD.80.055025

  • More on the finiteness of the anomalous magnetic moment in the gauge-Higgs unification Reviewed

    Yuki Adachi, C. S. Lim, Nobuhito Maru

    Physical Review D - Particles, Fields, Gravitation and Cosmology   79 ( 7 )   2009.04( ISSN:1550-7998

     More details

    Publishing type:Research paper (scientific journal)  

    We discuss the anomalous magnetic moment of fermion in a realistic SU(3) model of gauge-Higgs unification compactified on an orbifold S1/Z2 including Z2-odd bulk mass for fermions. An operator analysis implies that the anomalous magnetic moment should be finite and predictable, even though higher dimensional gauge theories are nonrenormalizable. Our main purpose is to clarify the cancellation mechanism of the UV divergences appearing in various types of Feynman diagrams. The cancellation of divergence turns out to take place between the contributions of the partners in the Higgs-like mechanism present in the nonzero Kaluza-Klein modes to form massive gauge bosons. It is also argued that the cancellation may be attributed to the quantum mechanical supersymmetry hidden in the scenario of gauge-Higgs unification. © 2009 The American Physical Society.

    DOI: 10.1103/PhysRevD.79.075018

  • More on the finiteness of the anomalous magnetic moment in the gauge-Higgs unification Reviewed

    Yuki Adachi, C. S. Lim, Nobuhito Maru

    Physical Review D - Particles, Fields, Gravitation and Cosmology   79 ( 7 )   2009.04( ISSN:1550-7998

     More details

    Publishing type:Research paper (scientific journal)  

    We discuss the anomalous magnetic moment of fermion in a realistic SU(3) model of gauge-Higgs unification compactified on an orbifold S1/Z2 including Z2-odd bulk mass for fermions. An operator analysis implies that the anomalous magnetic moment should be finite and predictable, even though higher dimensional gauge theories are nonrenormalizable. Our main purpose is to clarify the cancellation mechanism of the UV divergences appearing in various types of Feynman diagrams. The cancellation of divergence turns out to take place between the contributions of the partners in the Higgs-like mechanism present in the nonzero Kaluza-Klein modes to form massive gauge bosons. It is also argued that the cancellation may be attributed to the quantum mechanical supersymmetry hidden in the scenario of gauge-Higgs unification. © 2009 The American Physical Society.

    DOI: 10.1103/PhysRevD.79.075018

    Other URL: http://arxiv.org/pdf/0901.2229v2

  • Calculable One-Loop Contributions to S and T parameters in the Gauge-Higgs Unification Reviewed

    Maru Nobuhito

    Soryushiron Kenkyu Electronics   116 ( 3 )   C20   2008

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.24532/soken.116.3_C20

    CiNii Article

  • Two-loop Calculation of Higgs Mass in Gauge-Higgs Unification Reviewed

    Soryushiron Kenkyu Electronics   114 ( 4 )   D101   2007

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.24532/soken.114.4_D101

    CiNii Article

  • Supersymmetric Radius Stabilization in Warped Extra Dimensions Reviewed

    Soryushiron Kenkyu Electronics   110 ( 4 )   D64 - D65   2005

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.24532/soken.110.4_D64

    CiNii Article

▼display all

Books and Other Publications

  • 教育PRO

    ( Role: Contributor ,  【寄稿・次世代サイエンス】「異次元を通して自然界の根本原理を探求する」)

    株式会社ERP  2022.12 

     More details

    Book type:Scholarly book

  • ペスキン素粒子物理学

    Peskin E. Michael (丸 信人 訳)( Role: Sole translator)

    森北出版  2022.06  ( ISBN:9784627157316

     More details

    Total pages:ix, 410p   Book type:Scholarly book

    CiNii Books

  • ペスキン素粒子物理学

    Peskin Michael Edward, 丸 信人( Role: Sole author)

    森北出版  2022  ( ISBN:9784627157316

     More details

    Book type:Scholarly book

    CiNii Books

  • 超対称性

    丸 信人( Role: Sole author)

    数理科学2019年3月号  2019.02 

  • 数理科学2019年 3月号「対称性と物理学」

    丸 信人( Role: Contributor ,  超対称性)

    サイエンス社  2019.02 

     More details

    Book type:Scholarly book

  • 異次元空間へのいざない

    丸 信人( Role: Sole author)

    大阪市立科学館機関誌 月刊「うちゅう」2013年9月号  2013 

     More details

    Book type:Scholarly book

  • 異次元空間へのいざない

    丸 信人( Role: Sole author)

    大阪市立科学館機関誌 月刊「うちゅう」2013年9月号  2013 

     More details

    Book type:Scholarly book

  • 高次元時空から見たCP対称性の破れの起源

    丸 信人( Role: Sole author)

    日本物理学会学会誌  2010.07 

     More details

    Book type:Scholarly book

  • 高次元時空から見たCP対称性の破れの起源

    丸 信人( Role: Sole author)

    日本物理学会学会誌  2010.07 

     More details

    Book type:Scholarly book

▼display all

MISC

  • Triple Higgs Boson Coupling in Gauge-Higgs Unification

    Yuki Adachi, Nobuhito Maru

    2018.09

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We consider the triple coupling of the Higgs boson in the context of the<br />
    gauge-Higgs unification scenario. We show that the triple coupling of the Higgs<br />
    boson in this scenario generically deviates from SM prediction since the Higgs<br />
    potential in this scenario has a periodicity. We calculate the coupling in the<br />
    five-dimensional $SU(3)$ x $U(1)_X$ gauge-Higgs unification model and obtain<br />
    70% deviation from the SM prediction.

  • Revisiting Electroweak Symmetry Breaking and Higgs Mass in Gauge-Higgs Unification

    Yuki Adachi, Nobuhito Maru

    Phys. Rev. D 98, 015022 (2018)   2018.04

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We propose a new model of 5D $SU(3)\otimes U(1)_X$ gauge-Higgs unification<br />
    with a successful electroweak symmetry breaking and a realistic Higgs boson<br />
    mass. In our model, the representations of the fermions are very simple, the<br />
    ${\bf 3}, \overline{\bf 3}$ and $\bf \overline{15}$ representations of $SU(3)$<br />
    gauge group. Employing the anti-periodic boundary conditions for $\bf<br />
    \overline{15}$ reduces massless exotic fermions and simplifies the brane<br />
    localized mass terms. We calculate the 1-loop Higgs potential in detail and<br />
    find that a realistic electroweak symmetry breaking and the observed Higgs mass<br />
    are obtained.

    DOI: 10.1103/PhysRevD.98.015022

  • $SU(2)_L$ Doublet Vector Dark Matter from Gauge-Higgs Unification

    Nobuhito Maru, Nobuchika Okada, Satomi Okada

    Phys. Rev. D 98, 075021 (2018)   2018.03

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    A new vector dark matter (DM) scenario in the context of the gauge-Higgs<br />
    unification (GHU) is proposed. The DM particle is identified with an<br />
    electric-charge neutral component in an $SU(2)_L$ doublet vector field with the<br />
    same quantum number as the Standard Model Higgs doublet. Since such an<br />
    $SU(2)_L$ doublet vector field is incorporated in any models of the GHU<br />
    scenario, it is always a primary and model-independent candidate for the DM in<br />
    the scenario. The observed relic density is reproduced through a DM pair<br />
    annihilations into the weak gauge bosons with a TeV-scale DM mass, which is<br />
    nothing but the compactification scale of extra-dimensions. Due to the<br />
    higher-dimensional gauge structure of the GHU scenario, a pair of the DM<br />
    particles has no direct coupling with a single $Z$-boson/Higgs boson, so that<br />
    the DM particle evades the severe constraint from the current direct DM search<br />
    experiments.

    DOI: 10.1103/PhysRevD.98.075021

  • Fermionic minimal dark matter in 5D gauge-Higgs unification

    Nobuhito Maru, Nobuchika Okada, Satomi Okada

    PHYSICAL REVIEW D   96 ( 11 )   2017.12( ISSN:2470-0010 ( eISSN:2470-0029

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We propose a minimal dark matter (MDM) scenario in the context of a simple gauge-Higgs unification (GHU) model based on the gauge group SU(3) x U(1)' in five-dimensional Minkowski space with a compactification of the fifth dimension on the S-1/Z(2) orbifold. A pair of vectorlike SU(3) multiplet fermions in a higher-dimensional representation is introduced in the bulk, and the DM particle is identified with the lightest mass eigenstate among the components in the multiplets. In the original model description, the DM particle communicates with the Standard Model (SM) particles only through the bulk gauge interaction, and hence our model is the GHU version of the MDM scenario. There are two typical realizations of the DM particle in four-dimensional effective theory: (i) the DM particle is mostly composed of the SM SU(2)(L) multiplets, or (ii) the DM is mostly composed of the SM SU(2)(L) singlets. Since the case (i) is very similar to the original MDM scenario, we focus on the case (ii), which is a realization of the Higgs-portal DM scenario in the context of the GHU model. We identify an allowed parameter region to be consistent with the current experimental constraints, which will be fully covered by the direct dark matter detection experiments in the near future. In the presence of the bulk multiplet fermions in higher-dimensional SU(3) representations, we reproduce the 125 GeV Higgs boson mass through the renormalization group evolution of Higgs quartic coupling with the compactification scale of 10-100 TeV.

    DOI: 10.1103/PhysRevD.96.115023

  • Fermion dark matter in gauge-Higgs unification

    Nobuhito Maru, Takashi Miyaji, Nobuchika Okada, Satomi Okada

    JOURNAL OF HIGH ENERGY PHYSICS   ( 7 )   2017.07( ISSN:1029-8479

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We propose a Majorana fermion dark matter in the context of a simple gaugeHiggs Unification (GHU) scenario based on the gauge group SU(3) x U(1)' in 5-dimensional Minkowski space with a compactification of the 5th dimension on S-1 / Z(2) orbifold. The dark matter particle is identified with the lightest mode in SU(3) triplet fermions additionally introduced in the 5-dimensional bulk. We find an allowed parameter region for the dark matter mass around a half of the Standard Model Higgs boson mass, which is consistent with the observed dark matter density and the constraint from the LUX 2016 result for the direct dark matter search. The entire allowed region will be covered by, for example, the LUX-ZEPLIN dark matter experiment in the near future. We also show that in the presence of the bulk SU(3) triplet fermions the 125 GeV Higgs boson mass is reproduced through the renormalization group evolution of Higgs quartic coupling with the compactification scale of around 10(8) GeV.

    DOI: 10.1007/JHEP07(2017)048

  • Anomalous Higgs Yukawa Couplings and Recent LHC Data

    Arindam Das, Nobuhito Maru, Nobuchika Okada

    2017.04

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    Very recently, the CMS collaboration has reported a search for the production<br />
    for a Standard Model (SM) Higgs boson in association with a top quark pair ($t<br />
    bar{t} H$) at the LHC Run-2 and a best fit $t bar{t} H$ yield of $1.5 pm 0.5$<br />
    times the SM prediction with an observed significance of $3.3 sigma$. We study<br />
    a possibility of whether or not this observed deviation can be explained by<br />
    anomalous Higgs Yukawa couplings with the top and the bottom quarks, along with<br />
    the LHC Run-1 data for the Higgs boson properties. We find that anomalous top<br />
    and bottom Yukawa couplings with about $0-20$% and $10-40$% reductions from<br />
    their SM values, respectively, can simultaneously fit the recent CMS result and<br />
    the LHC Run-1 data.

  • Perturbative unification of gauge couplings in supersymmetric E-6 models

    Gi-Chol Cho, Nobuhito Maru, Kaho Yotsutani

    MODERN PHYSICS LETTERS A   31 ( 22 )   2016.07( ISSN:0217-7323 ( eISSN:1793-6632

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We study gauge coupling unification in supersymmetric (SUSY) E-6 models where an additional U(1)' gauge symmetry is broken near the TeV scale and a number of exotic matter fields from the 27 representations have O(TeV) mass. Solving the two-loop renormalization group equations (RGE) of gauge couplings and a kinetic mixing coupling between the U(1)' and U(1)(Y) gauge fields, we find that the gauge couplings fall into the non-perturbative regime below the grand unified theories (GUT) scale. We examine threshold corrections on the running of gauge couplings from both light and heavy (similar to GUT scale) particles and show constraints on the size of corrections to achieve the perturbative unification of gauge couplings.

    DOI: 10.1142/S0217732316501303

  • Trilinear gauge boson couplings in the gauge-Higgs unification

    Yuki Adachi, Nobuhito Maru

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   ( 7 )   2016.07( ISSN:2050-3911

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We examine trilinear gauge boson couplings (TGCs) in the context of the SU(3)(W) circle times U(1)' gauge-Higgs unification scenario. The TGCs play important roles in probes of the physics beyond the standard model, since they are highly restricted by the experiments. We discuss the mass spectrum of the neutral gauge boson with brane-localized mass terms carefully and find that the TGCs and rho parameter may deviate from standard model predictions. Finally, we put a constraint on these observables and discuss the possible parameter space.

    DOI: 10.1093/ptep/ptw088

  • Predictions of the Higgs Mass and the Weak Mixing Angle in the 6D Gauge-Higgs Unification

    Kouhei Hasegawa, Chong-Sa Lim, Nobuhito Maru

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   85 ( 7 )   2016.07( ISSN:0031-9015

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    In the gauge-Higgs unification with multiple extra spaces, the Higgs self-coupling is on the order of g(2) and the Higgs boson is predicted to be light, being consistent with the LHC results. When the gauge group is simple, the weak mixing angle is also predictable. We address a question on whether there exists a model of gauge-Higgs unification in six-dimensional space-time, which successfully predicts the mass ratios of the Higgs boson and weak gauge bosons. First, using a useful formula, we give a general argument on the condition for obtaining a realistic prediction of the weak mixing angle sin(2)theta(W) = 1/4, and find that triplet and sextet representations of the minimal SU(3) gauge group lead to the realistic prediction. Concerning the Higgs mass, we notice that, in the models with one Higgs doublet, the predicted Higgs mass is always the same: M-H = 2M(W). However, by extending our discussion to the models with two Higgs doublets, the situation changes: we obtain an interesting prediction M-H &lt;= 2M(W) at the leading order of the perturbation. Thus, it is possible to recover the observed Higgs mass, 125 GeV, for a suitable choice of the parameter. The situation is in clear contrast to the case of the minimal supersymmetric standard model, where M-H &lt;= M-Z at the classical level and the predicted Higgs mass cannot recover the observed value.

    DOI: 10.7566/JPSJ.85.074101

  • Nambu-Jona-Lasinio theory and dynamical breaking of supersymmetry

    Nobuhito Maru

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   ( 6 )   2016.06( ISSN:2050-3911

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    A recently proposed new mechanism of D-term-triggered dynamical supersymmetry breaking is reviewed. Supersymmetry is dynamically broken by a nonvanishing D-term vacuum expectation value, which is realized as a nontrivial solution of the gap equation in the self-consistent approximation, as in the case of the Nambu-Jona-Lasinio model and BCS superconductivity.

    DOI: 10.1093/ptep/ptw018

  • Anomalous Top and Bottom Yukawa Couplings and LHC Run 1 Data

    Nobuhito Maru, Nobuchika Okada

    2016.04

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    In some extensions of the Standard Model, Yukawa couplings of the physical<br />
    Higgs boson can be deviated from those in the Standard Model. We study a<br />
    possibility whether or not such anomalous Yukawa couplings are consistent with<br />
    the LHC Run 1 data. It is found that sizable deviations of top and bottom (and<br />
    tau) Yukawa couplings from the Standard Model predictions can nicely fit the<br />
    data. New physics beyond the Standard Model can be revealed through more<br />
    precise measurements of such anomalous Yukawa couplings at the LHC Run 2 in the<br />
    near future. We also discuss a simple setup which can leads to anomalous Yukawa<br />
    couplings.

  • 素粒子論領域,素粒子実験領域「Dirac gauginoによる低エネルギー超対称模型と拡張ヒッグスセクター」(企画講演,第70回年次大会(2015年)招待・企画・チュートリアル講演の報告,学会報告) Reviewed

    丸 信人

    日本物理學會誌   70 ( 8 )   636 - 636   2015.08( ISSN:0029-0181

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    CiNii Article

  • Deviation of Yukawa coupling in gauge-Higgs unification

    Yuki Adachi, Nobuhito Maru

    EUROPEAN PHYSICAL JOURNAL PLUS   130 ( 8 )   2015.08( ISSN:2190-5444

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We study the deviation of the Yukawa coupling in the gauge-Higgs unification scenario from the Standard Model one. Taking into account the brane mass terms necessary for generating the flavor mixing and removing the exotic massless fermions, we derive an analytic formula determining the KK mass spectrum and Yukawa coupling. Applying the obtained results to the tau and bottom Yukawa couplings, we numerically calculate the ratio of the Yukawa couplings in the gauge-Higgs unification and in the Standard Model.

    DOI: 10.1140/epjp/i2015-15168-3

  • Deviation of Yukawa coupling in gauge-Higgs unification

    Yuki Adachi, Nobuhito Maru

    EUROPEAN PHYSICAL JOURNAL PLUS   130 ( 8 )   2015.08( ISSN:2190-5444

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We study the deviation of the Yukawa coupling in the gauge-Higgs unification scenario from the Standard Model one. Taking into account the brane mass terms necessary for generating the flavor mixing and removing the exotic massless fermions, we derive an analytic formula determining the KK mass spectrum and Yukawa coupling. Applying the obtained results to the tau and bottom Yukawa couplings, we numerically calculate the ratio of the Yukawa couplings in the gauge-Higgs unification and in the Standard Model.

    DOI: 10.1140/epjp/i2015-15168-3

  • Is the 126 GeV Higgs boson mass calculable in gauge-Higgs unification?

    C. S. Lim, Nobuhito Maru, Takashi Miura

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   ( 4 )   2015.04( ISSN:2050-3911

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We address the question of whether the recently observed Higgs mass M-H = 126 GeV, of the order of the weak scale MW, is calculable as a finite value in the scenario of gauge-Higgs unification. In the scenario formulated on a flat five-dimensional space-time, the Higgs mass is calculable, being protected under the quantum correction by gauge invariance, though the predicted Higgs mass is generally too small compared with M-W. In the six-dimensional SU(3) model, however, a suitable orbifolding is known to lead to a mass of the order of M-W: M-H = 2M(W) at the tree level, which has some similarity to the corresponding prediction by the minimal supersymmetric standard model, M-H &lt;= (cos beta) M-Z.
    We demonstrate first by a general argument and secondly by explicit calculations that, even though the quantum correction to the quartic self-coupling of the Higgs field is UV-divergent, its deviation from that of g(2) is calculable, and therefore two observables, M-H(2) and Delta equivalent to (M-H/2M(W))(2) - 1, are both calculable in the gauge-Higgs unification scenario. The implication of the precise value 126 GeV to the compactification scale and the bulk mass of the matter field in our model is also discussed.

    DOI: 10.1093/ptep/ptv030

  • Mass sum rule of the effective action on vacua with broken rigid N=1 supersymmetry

    H. Itoyama, Nobuhito Maru

    NUCLEAR PHYSICS B   893   332 - 345   2015.04( ISSN:0550-3213 ( eISSN:1873-1562

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We present an extension of the mass sum rule that applies to renormalizable rigid supersymmetric field theories to the case of the N = 1 supersymmetric effective action (the gauged non-linear sigma model) consisting of adjoint scalar superfields and vector superfields possessing a Kahler potential, a set of gauge coupling functions (second prepotential derivatives) and a superpotential, which respectively set their energy scales. The mass sum rule derived is valid for any vacua, including the (metastable) one of broken supersymmetry with the condensates of D-term and/or F-term. We manage to extend these analyses to the cases where superfields in (anti-)fundamental representation are present. The supertrace is shown to vanish in those cases where underlying geometry is special Kahler and theory under concern is anomaly free. Simple phenomenological application is given, providing an upper bound for gaugino masses. We discuss that the effects of the D and/or F condensates can be represented as a set of soft breaking terms with their strengths predicted by the scales. (C) 2015 The Authors. Published by Elsevier B.V.

    DOI: 10.1016/j.nuclphysb.2015.02.017

  • Higgs Mass in D-Term triggered Dynamical SUSY Breaking

    Nobuhito Maru

    2015.03

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We discuss a new mechanism of D-term dynamical supersymmetry breaking in the<br />
    context of Dirac gaugino scenario. The existence of a nontrivial solution of<br />
    the gap equation for D-term is shown. It is also shown that an observed 126 GeV<br />
    Higgs mass is realized by tree level D-term effects in a broad range of<br />
    parameters.

  • Collider Signatures of Gauge-Higgs Unification at LHC

    Nobuhito Maru

    2015.03

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We have studied the Kaluza-Klein (KK) mode contributions to the diphoton<br />
    decay of Higgs boson through the gluon fusion at LHC in a five dimensional<br />
    $SU(3) times U(1)&#039;$ gauge-Higgs unification (GHU) model. The minimal matter<br />
    content case is found that the diphoton decay is necessarily destructive<br />
    comparing to the Standard Model (SM) prediction, which is unfortunately not<br />
    supported by the current experimental data. Two extensions are considered to<br />
    not only enhance the diphoton decay but also realize an observed Higgs mass.<br />
    The $Z gamma$ decay of Higgs boson is also studied and the striking result is<br />
    found that there is no KK mode contributions to the decay at 1-loop level. This<br />
    fact might be very useful to discriminate the GHU from other physics beyond the<br />
    SM.

  • $H \to b \bar{b}, τ\barτ$ in Gauge-Higgs Unification

    Yuki Adachi, Nobuhito Maru

    2015.01

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We study the deviation of Higgs production through the gluon fusion process<br />
    and the decay of Higgs boson to the bottom quark and the tau lepton in<br />
    gauge-Higgs unification from the Standard Model prediction. We find that the<br />
    signal strength of $gg \to H \to b\bar{b}, \tau\bar{\tau}$ is necessarily<br />
    suppressed comparing to the SM predictions due to the dominant suppression of<br />
    the Higgs production via gluon fusion.

  • 126 GeV higgs boson associated with D-term triggered dynamical supersymmetry breaking

    Hiroshi Itoyama, Nobuhito Maru

    Symmetry   7 ( 1 )   193 - 205   2015( ISSN:2073-8994

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    Continuing with our previous work on D-term triggered dynamical supersymmetry breaking, we consider a system in which our generic N = 1 action is minimally extended to include the pair of Higgs doublet superfields charged under the overall U(1) together with μ and Bμ terms. The gauge group is taken to be SU(3)C × SU(2)L × U(1)Y × U(1). We point out, among other things, that the Higgs mass less than the Z-boson mass at tree level can be pushed up to be around 126 GeV by D-term contributions of the overall U(1). This is readily realized by taking a U(1) gauge coupling to be O(1).

    DOI: 10.3390/sym7010193

  • One-loop radiative correction to Kaluza-Klein masses in S-2/Z(2) universal extra-dimensional model

    Nobuhito Maru, Takaaki Nomura, Joe Sato

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   ( 8 )   2014.08( ISSN:2050-3911

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We investigate a radiative correction to the masses of Kaluza-Klein (KK) modes in a universal extra-dimensional model defined on a six-dimensional spacetime with extra space as a two-sphere orbifold S-2/Z(2). We first define the Feynman rules which are necessary for the calculation. We then calculate the one-loop diagrams which contribute to the radiative corrections to the KK masses, and obtain one-loop corrections to masses for fermions, gauge bosons, and scalar bosons. We estimate the one-loop corrections to KK masses for the first KK modes of standard model particles as a function of momentum cut-off scale, and we determine the lightest KK particle which would be a promising candidate for dark matter.

    DOI: 10.1093/ptep/ptu113

  • mu to 3e and mu to e Conversion in Gauge-Higgs Unification

    Yuki Adachi, Nobuaki Kurahashi, Nobuhito Maru

    2014.04

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    The two dominant processes of lepton flavor violation, mu to 3e and mu to e<br />
    conversion in atomic nuclei caused by neutral KK gauge boson exchanges at tree<br />
    level, are studied in the context of five dimensional gauge-Higgs unification<br />
    scenario. The key point of the flavor violation is a fact that the bulk masses<br />
    and the brane ones cannot be simultaneously diagonalized. We estimate the<br />
    branching ratio of each processes and obtain the lower bound of<br />
    compactification scale around weak scale from the current experimental data. We<br />
    discuss the reasons why the final result is not so severe although the large<br />
    mixing in the lepton sector seems to give large lepton flavor violation<br />
    processes.

  • 125 GeV Higgs Boson and TeV Scale Colored Fermions in Gauge-Higgs Unification

    Nobuhito Maru, Nobuchika Okada

    2013.10

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    In the context of a simple gauge-Higgs unification scenario based on the<br />
    gauge group SU(3) times U(1)&#039; in a 5-dimensional flat spacetime, we investigate<br />
    a possibility to realize the Higgs boson mass of 125 GeV with a<br />
    compactification scale at the TeV. With the introduction of colored bulk<br />
    fermions in a certain representation under the gauge group with a half-periodic<br />
    boundary condition, we analyze the one-loop RGE of the Higgs quartic coupling<br />
    with the gauge-Higgs condition and successfully obtain 125 GeV Higgs boson mass<br />
    by adjusting a bulk mass for the fermions with a fixed compactification scale.<br />
    The Kaluza-Klein modes of the colored fermions contribute to the<br />
    Higgs-to-digluon effective coupling through the one-loop corrections. Since the<br />
    contribution is destructive to the Standard Model one and reduces the Higgs<br />
    boson production cross section, the recent LHC result gives a lower bound on<br />
    the mass of the lightest Kaluza-Klein mode fermion. We find the mass of the<br />
    lightest Kaluza-Klein mode fermion in the range of 2-3 TeV for 10%-5%<br />
    reductions of the Higgs boson production cross section through the gluon fusion<br />
    channel. Such Kaluza-Klein mode fermions can be discovered at the LHC run II<br />
    with sqrt{s}=13-14 TeV, and LHC phenomenology for the Kaluza-Klein fermions is<br />
    briefly discussed.

  • 20pSE-7 D-Term Triggered Dynamical Supersymmetry Breaking Reviewed

    Itoyama H., Maru N.

    Meeting abstracts of the Physical Society of Japan   68 ( 2 )   4 - 4   2013.08( ISSN:1342-8349

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    CiNii Article

  • H -&gt; Z gamma in gauge-Higgs unification

    Nobuhito Maru, Nobuchika Okada

    PHYSICAL REVIEW D   88 ( 3 )   2013.08( ISSN:1550-7998

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    In our previous paper [N. Maru and N. Okada, Phys. Rev. D 87, 095019 (2013)], we have investigated effects of a simple gauge-Higgs unification model on the diphoton signal events from the Higgs boson production at the Large Hadron Collider. We have found that in this model the effective Higgs-to-diphoton coupling can be enhanced by 1-loop corrections with Kaluza-Klein (KK) modes of bulk fields. This result can be an explanation for the observed excess of the signal strength in the Higgs-to-diphoton decay channel. In this paper, we investigate KK-mode effects on another Higgs boson decay mode, H -&gt; Z gamma. One naturally expects that the KK modes also contribute to the effective H-Z-gamma coupling and can cause some deviation for the H -&gt; Z gamma decay mode from the Standard Model prediction. Revealing a correlation between the KK-mode effects on the Higgs-to-diphoton and H-Z-gamma couplings is an interesting topic in terms of a possibility to discriminate a variety of models for physics beyond the Standard Model. We show a very striking result for the gauge-Higgs unification model, namely, the absence of KK-mode contributions to the H-Z-gamma coupling at the 1-loop level. This is a very specific and general prediction of the gauge-Higgs unification scenario.

    DOI: 10.1103/PhysRevD.88.037701

  • D-term triggered dynamical supersymmetry breaking

    H. Itoyama, Nobuhito Maru

    Physical Review D - Particles, Fields, Gravitation and Cosmology   88 ( 2 )   2013.07( ISSN:1550-7998

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We present the mechanism of the dynamical supersymmetry breaking at the metastable vacuum recently uncovered in the N=1 U(N) supersymmetric gauge theory that contains adjoint superfields and that is specified by Kähler and noncanonical gauge kinetic functions and a superpotential whose tree vacua preserve N=1 supersymmetry. The overall U(1) serves as the hidden sector, and no messenger superfield is required. The dynamical supersymmetry breaking is triggered by the nonvanishing D term coupled to the observable sector and is realized by the self-consistent Hartree-Fock approximation of the Nambu-Jona-Lasinio type while it eventually brings us the nonvanishing F term as well. It is shown that theoretical analysis is resolved as a variational problem of the effective potential for three kinds of background fields, namely, the complex scalar, and the two order parameters D and F of supersymmetry, the last one being treated perturbatively. We determine the stationary point and numerically check the consistency of such treatment as well as the local stability of the scalar potential. The coupling to the N=1 supergravity is given, and the gravitino mass formula is derived. © 2013 American Physical Society.

    DOI: 10.1103/PhysRevD.88.025012

  • Diphoton decay excess and 125 GeV Higgs boson in gauge-Higgs unification

    Nobuhito Maru, Nobuchika Okada

    PHYSICAL REVIEW D   87 ( 9 )   2013.05( ISSN:1550-7998

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    In the context of the gauge-Higgs unification scenario in a 5-dimensional flat spacetime, we investigate Higgs boson production via gluon fusion and its diphoton decay mode at the LHC. We show that the signal strength of the Higgs diphoton decay mode observed at ATLAS and CMS, which is considerably larger than the Standard Model expectation, can be explained by a simple gauge-Higgs unification model with color-singlet bulk fermions to which a half-periodic boundary condition is assigned. The bulk fermions also play a crucial role in reproducing the observed Higgs boson mass around 125 GeV.

    DOI: 10.1103/PhysRevD.87.095019

  • Diphoton decay excess and 125 GeV Higgs boson in gauge-Higgs unification

    Nobuhito Maru, Nobuchika Okada

    PHYSICAL REVIEW D   87 ( 9 )   2013.05( ISSN:1550-7998

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    In the context of the gauge-Higgs unification scenario in a 5-dimensional flat spacetime, we investigate Higgs boson production via gluon fusion and its diphoton decay mode at the LHC. We show that the signal strength of the Higgs diphoton decay mode observed at ATLAS and CMS, which is considerably larger than the Standard Model expectation, can be explained by a simple gauge-Higgs unification model with color-singlet bulk fermions to which a half-periodic boundary condition is assigned. The bulk fermions also play a crucial role in reproducing the observed Higgs boson mass around 125 GeV.

    DOI: 10.1103/PhysRevD.87.095019

  • Metastable D-term Dynamical SUSY Breaking

    Nobuhito Maru

    2013.03

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We present the mechanism of the dynamical supersymmetry (SUSY) breaking at<br />
    the metastable vacuum in the N=1 U(N) SUSY gauge theory with adjoint<br />
    superfields. The dynamical SUSY breaking is triggered by the non-vanishing<br />
    D-term coupled to the observable sector, and is realized by the self-consistent<br />
    Hartree-Fock approximation of the NJL type while it eventually brings us the<br />
    non-vanishing F-term as well. We numerically check the local stability of our<br />
    metastable vacuum.

    DOI: 10.1142/9789814566254_0030

  • D-TERM DYNAMICAL SUPERSYMMETRY BREAKING GENERATING SPLIT N=2 GAUGINO MASSES OF MIXED MAJORANA-DIRAC TYPE

    H. Itoyama, Nobuhito Maru

    INTERNATIONAL JOURNAL OF MODERN PHYSICS A   27 ( 26 )   2012.10( ISSN:0217-751X

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    Under a few mild assumptions, N = 1 supersymmetry (SUSY) in four dimensions is shown to be spontaneously broken in a metastable vacuum in a self-consistent Hartree-Fock approximation of Bardeen-Cooper-Schrieffer/Nambu-Jona-Lasinio (BCS/NJL) type to the leading order, in the gauge theory specified by the gauge kinetic function and the superpotential of adjoint chiral superfields, in particular, that possess N = 2 extended SUSY spontaneously broken to N = 1 at tree level. We derive an explicit form of the gap equation, showing the existence of a nontrivial solution. The N = 2 gauginos in the observable sector receive mixed Majorana-Dirac masses and are split due to both the nonvanishing &lt; D-0 &gt; and &lt; F-0 &gt; induced with &lt; D-0 &gt;. It is argued that proper physical applications and assessment of the range of the validity of our framework are made possible by rendering the approximation into 1/N-2 expansion.

    DOI: 10.1142/S0217751X1250159X

  • D-term Dynamical SUSY Breaking

    Hiroshi Itoyama, Nobuhito Maru

    2012.07

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We consider an N=1 supersymmetric U(N) gauge theory with an adjoint chiral<br />
    multiplet. By developing a self-consistent Hartree-Fock approximation to the<br />
    leading order which is reminiscent of that of the BCS/NJL in the<br />
    superconductivity/chiral symmetry, we show that the N=1 supersymmetry is<br />
    spontaneously broken, giving a mixed Majorana-Dirac mass term for gaugino due<br />
    to the nonvanishing D-term VEV and F-term one induced by D-term.

    DOI: 10.1142/S2010194513009392

  • B-0 - (B)over-bar(0) mixing in gauge-Higgs unification

    Yuki Adachi, Nobuaki Kurahashi, Nobuhito Maru, Kazuya Tanabe

    PHYSICAL REVIEW D   85 ( 9 )   2012.05( ISSN:1550-7998

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We discuss flavor mixing and resulting flavorchanging neutral current in a five-dimensional SU(3)(color) circle times SU(3) circle times U'(1) gauge-Higgs unification. Flavor mixing is realized by the fact that the bulk and brane-localized mass terms are not diagonalized simultaneously. As the concrete flavor-changing neutral current processes, we calculate the rate of B-d(0) - (B) over bar (0)(d) mixing and B-s(0) - (B) over bar (0)(s) mixing due to the exchange of nonzero Kaluza-Klein gluons at the tree level. We obtain a lower bound on the compactification scale of order O(TeV) by comparing our prediction on the mass difference of neutral B meson with the recent experimental data.

    DOI: 10.1103/PhysRevD.85.096001

  • D-0 - (D)over-bar(0) mixing in gauge-Higgs unification

    Yuki Adachi, Nobuaki Kurahashi, C. S. Lim, Nobuhito Maru

    JOURNAL OF HIGH ENERGY PHYSICS   ( 1 )   2012.01( ISSN:1029-8479

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We discuss flavor mixing and resulting Flavor Changing Neutral Current (FCNC) in the SU(3) circle times SU(3)(color) gauge-Higgs unification. As the FCNC process we calculate the rate of D-0 - (D) over bar (0) mixing due to the exchange of non-zero Kaluza-Klein gluons at the tree level. Flavor mixing is argued to be realized by the fact that the bulk mass term and brane localized mass term is not diagonalized simultaneously unless bulk masses are degenerate. It is shown that automatic suppression mechanism is operative for the FCNC processes of light quarks. We therefore obtain a lower bound on the compactification scale of order O(TeV) by comparing our prediction on the mass difference of neutral D meson with the recent experimental data, which is much milder than what we naively expect assuming only the decoupling of non-zero Kaluza-Klein gluons.

    DOI: 10.1007/JHEP01(2012)047

  • Flavor Mixing in Gauge-Higgs Unification

    Y. Adachi, N. Kurahashi, C. S. Lim, N. Maru, K. Tanabe

    GUT2012   1467   258 - 261   2012( ISSN:0094-243X

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    Gauge-Higgs unification is the fascinating scenario solving the hierarchy problem without supersymmetry. In this scenario, the Standard Model (SM) Higgs doublet is identified with extra component of the gauge field in higher dimensions and its mass becomes finite and stable under quantum corrections due to the higher dimensional gauge symmetry. On the other hand, Yukawa coupling is provided by the gauge coupling, which seems to mean that the flavor mixing and CP violation do not arise at it stands. In this talk, we discuss that the flavor mixing is originated from simultaneously non-diagonalizable bulk and brane mass matrices. Then, this mechanism is applied to various flavor changing neutral current (FCNC) processes via Kaluza-Klein (KK) gauge boson exchange at tree level and constraints for compactification scale are obtained.

    DOI: 10.1063/1.4742112

  • Flavor Mixing in Gauge-Higgs Unification

    Y. Adachi, N. Kurahashi, C. S. Lim, N. Maru, K. Tanabe

    GUT2012   1467   258 - 261   2012( ISSN:0094-243X

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    Gauge-Higgs unification is the fascinating scenario solving the hierarchy problem without supersymmetry. In this scenario, the Standard Model (SM) Higgs doublet is identified with extra component of the gauge field in higher dimensions and its mass becomes finite and stable under quantum corrections due to the higher dimensional gauge symmetry. On the other hand, Yukawa coupling is provided by the gauge coupling, which seems to mean that the flavor mixing and CP violation do not arise at it stands. In this talk, we discuss that the flavor mixing is originated from simultaneously non-diagonalizable bulk and brane mass matrices. Then, this mechanism is applied to various flavor changing neutral current (FCNC) processes via Kaluza-Klein (KK) gauge boson exchange at tree level and constraints for compactification scale are obtained.

    DOI: 10.1063/1.4742112

  • B^0-\bar B^0 Mixing in Gauge-Higgs Unification Reviewed

    Yuki Adachi, Nobuaki Kurahashi, Nobuhito Maru, Kazuya Tanabe

    Phys.Rev. D85 (2012) 096001   2011.12

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    We discuss flavor mixing and resulting Flavor Changing Neutral Current (FCNC)
    in a five dimensional SU(3)_color \otimes SU(3) \otimes U'(1) gauge-Higgs
    unification. Flavor mixing is realized by the fact that the bulk and brane
    localized mass terms are not diagonalized simultaneously. As the concrete FCNC
    processes, we calculate the rate of B^0_d-\bar B^0_d mixing and B^0_s-\bar
    B^0_s mixing due to the exchange of non-zero Kaluza-Klein gluons at the tree
    level. We obtain a lower bound on the compactification scale of order O(TeV) by
    comparing our prediction on the mass difference of neutral B meson with the
    recent experimental data.

    DOI: 10.1103/PhysRevD.85.096001

  • A Chiral Model of Metastable SUSY Breaking via Chiral/Nonchiral Seiberg Duality

    Nobuhito Maru

    2011.11

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We propose a new chiral model of metastable supersymmetry breaking in the<br />
    conformal window via chiral/nonchiral Seiberg duality, which is focused on<br />
    Spin(7)/SU(N_f-4) duality in this letter. Following the approach of<br />
    Intriligator-Seiberg-Shih model, a small mass perturbation in the nonchiral<br />
    theory leads to supersymmetry breaking by rank condition in the chiral dual<br />
    description.

  • 16aSA-1 Direct gauge mediation of Uplifted metastable supersymmetry breaking in supergravity Reviewed

    Maru Nobuhito

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   1 - 1   2011.08( ISSN:1342-8349

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    CiNii Article

  • D^0-\bar D^0 Mixing in Gauge-Higgs Unification Reviewed

    Yuki Adachi, Nobuaki Kurahashi, C. S. Lim, Nobuhito Maru

    JHEP 1201 (2012) 047   2011.03

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    We discuss flavor mixing and resulting Flavor Changing Neutral Current (FCNC)
    in the SU(3) \otimes SU(3)_color gauge-Higgs unification. As the FCNC process
    we calculate the rate of D^0-\bar D^0 mixing due to the exchange of non-zero
    Kaluza-Klein gluons at the tree level. Flavor mixing is argued to be realized
    by the fact that the bulk mass term and brane localized mass term is not
    diagonalized simultaneously unless bulk masses are degenerate. It is shown that
    automatic suppression mechanism is operative for the FCNC processes of light
    quarks. We therefore obtain a lower bound on the compactification scale of
    order \cal O(TeV) by comparing our prediction on the mass difference of neutral
    D meson with the recent experimental data, which is much milder than what we
    naively expect assuming only the decoupling of non-zero Kaluza-Klein gluons.

    DOI: 10.1007/JHEP01(2012)047

  • Lower bound for compactification scale from muon g-2 in the gauge-Higgs unification

    Yuki Adachi, C. S. Lim, Nobuhito Maru

    NUCLEAR PHYSICS B   839 ( 1-2 )   52 - 95   2010.11( ISSN:0550-3213 ( eISSN:1873-1562

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We discuss a muon anomalous magnetic moment in a five dimensional SU(3) gauge-Higs unification compactilied on M-4 x S-1 /Z(2) space-time including Z(2)-odd bulk mass for a fermion We calculate one-loop corrections to the anomalous magnetic moment of muon and find a lower bound for the compactification scale to be around 5 similar to 6 TeV by comparing nonzero Kaluza-Klein mode contributions with the muon (g - 2) experiment at BNL (C) 2010 Elsevier B V All rights reserved

    DOI: 10.1016/j.nuclphysb.2010.06.001

  • Direct gauge mediation of uplifted metastable supersymmetry breaking in supergravity

    Nobuhito Maru

    PHYSICAL REVIEW D   82 ( 7 )   2010.10( ISSN:1550-7998

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We propose a direct gauge mediation model based on an uplifted metastable supersymmetry (SUSY) breaking coupled to supergravity. A constant superpotential plays an essential role to fix the moduli as well as breaking SUSY and R symmetry and the cancellation of the cosmological constant. Gaugino masses are generated at leading order of SUSY breaking scale, and comparable to the sfermion masses as in the ordinary gauge mediation. The Landau pole problem for QCD coupling can be easily solved since more than half of messengers become superheavy, which are heavier than the grand unified theory (GUT) scale.

    DOI: 10.1103/PhysRevD.82.075015

  • The Origin of CP Violation from the Viewpoint of Higher Dimensional Space-time Reviewed

    MARU Nobuhito

    Butsuri   65 ( 7 )   545 - 548   2010.07( ISSN:0029-0181

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    Professors M. Kobayashi and T. Maskawa proposed a mechanism of CP violation in the Standard Model of particle physics. CP violation is closely related to solve the mystery of asymmetry between particles and anti-particles in the universe, but it is known that Kobayashi-Maskawa theory cannot explain the present aymmetry satisfactorily. In this article, we report our recent results on new CP violation mechanisms based on higher dimensional theories.

    CiNii Article

  • Flavor Mixing in Gauge-Higgs Unification Reviewed

    Yuki Adachi, Nobuaki Kurahashi, C. S. Lim, Nobuhito Maru

    JHEP 1011:150,2010   2010.05

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    We discuss flavor mixing and resultant flavor changing neutral current
    processes in the SU(3) \otimes SU(3)_\text{color} gauge-Higgs unification
    scenario. To achieve flavor violation is a challenging issue in the scenario,
    since the Yukawa couplings are originally higher dimensional gauge
    interactions. We argue that the presence of Z_2-odd bulk masses of fermions
    plays a crucial role as the new source of flavor violation. Although
    introducing brane-localized mass terms in addition to the bulk masses is
    necessary to realize flavor mixing, if the bulk masses were universal among
    generations, the flavor mixing and flavor changing neutral current processes
    are known to disappear. We also discuss whether natural flavor conservation is
    realized in the scenario. It is shown that the new source of flavor violation
    leads to flavor changing neutral current processes at the tree level due to the
    exchange of non-zero Kaluza-Klein gauge bosons. As a typical example we
    calculate the rate of K^0 - \bar{K}^0 mixing due to the non-zero Kaluza-Klein
    gluon exchange at the tree level. The obtained result for the mass difference
    of neutral kaon is suppressed by the inverse powers of the compactification
    scale. By comparing our prediction with the data we obtain the lower bound of
    the compactification scale as a function of one unfixed parameter of the
    theory, which is of {\cal O}(10) TeV, except for some extreme cases. We argue
    that the reason to get such rather mild lower bound is the presence of
    "GIM-like" mechanism, which is a genuine feature of GHU scenario.

    DOI: 10.1007/JHEP11(2010)150

  • The universal extra dimensional model with S-2/Z(2) extra-space

    Nobuhito Maru, Takaaki Nomura, Joe Sato, Masato Yamanaka

    NUCLEAR PHYSICS B   830 ( 3 )   414 - 433   2010.05( ISSN:0550-3213 ( eISSN:1873-1562

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We propose a new universal extra dimensional model that is defined on a six-dimensional spacetime which has a two-sphere orbifold S-2/Z(2) as an extra-space. We specify our model by choosing the gauge symmetry as SU(3) x SU(2) x U(1)(Y) x U(1)(X), introducing field contents in six dimensions as their zero modes correspond to the standard model particles, and determining a boundary condition of these fields on orbifold S-2/Z(2). A background gauge field that belongs to U(1)(X) is introduced there, which is necessary to obtain massless chiral fermions in four-dimensional spacetime. We then analyze Kaluza-Klein (KK) mode expansion of the fields in our model and derive the mass spectrum of the KK particles. We find that the lightest KK particles are the 1st KK particles of massless gauge bosons al. tree level. We also discuss the KK parity of the KK modes in our model and confirm the stability of the lightest KK particle which is important for dark matter physics. (C) 2009 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nuclphysb.2009.11.023

  • Modulus stabilization and IR-brane kinetic terms in gauge-Higgs unification

    Nobuhito Maru, Yutaka Sakamura

    JOURNAL OF HIGH ENERGY PHYSICS   ( 4 )   2010.04( ISSN:1029-8479

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We discuss the modulus stabilization by the Casimir energy and various effects of IR-brane kinetic terms for the gauge fields in a gauge-Higgs unification model in the warped spacetime, where the Wilson line phase theta(H) is determined as theta(H) = pi/2. We find that the brane kinetic terms with O(1) coefficients are necessary for the modulus stabilization. On the other hand, large brane kinetic terms can deviate 4D gauge couplings from the standard model values and also cause too light Kaluza-Klein (KK) modes. In the parameter region that ensures the modulus stabilization, the KK gluon appears below 1TeV, which marginally satisfies the experimental bound. The allowed parameter region will be enlarged in a model where a smaller value of theta(H) is realized.

    DOI: 10.1007/JHEP04(2010)100

  • CP violation due to compactification

    C. S. Lim, Nobuhito Maru, Kenji Nishiwaki

    PHYSICAL REVIEW D   81 ( 7 )   2010.04( ISSN:2470-0010 ( eISSN:2470-0029

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We address the challenging issue of how CP violation is realized in higher dimensional gauge theories without higher dimensional elementary scalar fields. In such theories interactions are basically governed by a gauge principle and therefore to get CP violating phases is a nontrivial task. It is demonstrated that CP violation is achieved as the result of compactification of extra dimensions, which is incompatible with the 4-dimensional CP transformation. As a simple example we adopt a 6-dimensional U(1) model compactified on a 2-dimensional orbifold T-2/Z(4). We argue that the 4-dimensional CP transformation is related to the complex structure of the extra space and show how the Z(4) orbifolding leads to CP violation. We confirm by explicit calculation of the interaction vertices that CP violating phases remain even after the rephasing of relevant fields. For completeness, we derive a rephasing invariant CP violating quantity, following a similar argument in the Kobayashi-Maskawa model which led to the Jarlskog parameter. As an example of a CP violating observable we briefly comment on the electric dipole moment of the electron.

    DOI: 10.1103/PhysRevD.81.076006

  • Higgs production via gluon fusion in a six-dimensional universal extra dimension model on S (2)/Z (2)

    Nobuhito Maru, Takaaki Nomura, Joe Sato, Masato Yamanaka

    EUROPEAN PHYSICAL JOURNAL C   66 ( 1-2 )   283 - 287   2010.03( ISSN:1434-6044 ( eISSN:1434-6052

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We investigate Higgs boson production process via gluon fusion at LHC in our six-dimensional universal extra dimension model compactified on a spherical orbifold S (2)/Z (2). We find a striking result that the Higgs production cross section in our model is predicted to have 30(10)% enhancement compared to the predictions of the Standard Model (the minimal universal extra dimension model) for the compactification scale of order 1 TeV.

    DOI: 10.1140/epjc/s10052-010-1236-3

  • Gauge-Higgs Unification at the LHC

    Nobuhito Maru, Nobuchika Okada

    2010.02

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    Higgs boson production by the gluon fusion and its decay into two photons at<br />
    the LHC are investigated in the context of the gauge-Higgs unification<br />
    scenario. The qualitative behaviors for these processes in the scenario are<br />
    quite distinguishable from those of the Standard Model and the universal extra<br />
    dimension scenario because of the overall sign difference for the effective<br />
    couplings induced by one-loop corrections through Kaluza-Klein modes.

    DOI: 10.1142/9789814329521_0017

  • CP Violation due to Compactification Reviewed

    C. S. Lim, Nobuhito Maru, Kenji Nishiwaki

    Phys.Rev.D81:076006,2010   2009.10

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    We address the challenging issue of how CP violation is realized in higher
    dimensional gauge theories without higher dimensional elementary scalar fields.
    In such theories interactions are basically governed by a gauge principle and
    therefore to get CP violating phases is a non-trivial task. It is demonstrated
    that CP violation is achieved as the result of compactification of extra
    dimensions, which is incompatible with the 4-dimensional CP transformation. As
    a simple example we adopt a 6-dimensional U(1) model compactified on a
    2-dimensional orbifold $T^{2}/Z_{4}$. We argue that the 4-dimensional CP
    transformation is related to the complex structure of the extra space and show
    how the $Z_{4}$ orbifolding leads to CP violation. We confirm by explicit
    calculation of the interaction vertices that CP violating phases remain even
    after the re-phasing of relevant fields. For completeness, we derive a
    re-phasing invariant CP violating quantity, following a similar argument in the
    Kobayashi-Maskawa model which led to the Jarlskog parameter. As an example of a
    CP violating observable we briefly comment on the electric dipole moment of the
    electron.

    DOI: 10.1103/PhysRevD.81.076006

  • Neutron electric dipole moment in the gauge-Higgs unification

    Yuki Adachi, C. S. Lim, Nobuhito Maru

    PHYSICAL REVIEW D   80 ( 5 )   2009.09( ISSN:2470-0010 ( eISSN:2470-0029

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We study the neutron electric dipole moment (EDM) in a five-dimensional SU(3) gauge-Higgs unification compactified on M-4 x S-1/Z(2) space-time including a massive fermion. We point out that to realize the CP violation is a nontrivial task in the gauge-Higgs unification scenario and argue how the CP symmetry is broken spontaneously by the vacuum expectation value of the Higgs, the extra space component of the gauge field. We emphasize the importance of the interplay between the vacuum expectation value of the Higgs and the Z(2)-odd bulk mass term to get physically the CP violation. We then calculate the one-loop contributions to the neutron EDM as the typical example of the CP violating observable and find that the EDM appears already at the one-loop level, without invoking the three-generation scheme. We then derive a lower bound for the compactification scale, which is around 2.6 TeV, by comparing the contribution due to the nonzero Kaluza-Klein modes with the experimental data.

    DOI: 10.1103/PhysRevD.80.055025

  • Meson-nucleon coupling from AdS/QCD

    Nobuhito Maru, Motoi Tachibana

    EUROPEAN PHYSICAL JOURNAL C   63 ( 1 )   123 - 132   2009.09( ISSN:1434-6044

     More details

    Publishing type:Book review, literature introduction, etc.  

    In this manuscript, a unified approach to hadron physics from the holographic point of view is described. After the introduction of a general setup for the meson nucleon system based on the bottom-up approach of QCD (AdS/QCD), as an illustration, we specifically examine meson-nucleon couplings. This is an example of the notion we call "holographic unification" in hadron physics.

    DOI: 10.1140/epjc/s10052-009-1096-x

  • 11aSJ-2 The Universal Extra Dimensional Model with S^2/Z_2 extra-space Reviewed

    Maru Nobuhito, Nomura Takaaki, Sato Joe, Yamanaka Masato

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   8 - 8   2009.08( ISSN:1342-8349

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    CiNii Article

  • Neutron Electric Dipole Moment in the Gauge-Higgs Unification Reviewed

    Yuki Adachi, C. S. Lim, Nobuhito Maru

    Phys.Rev.D80:055025,2009   2009.05

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    We study the neutron electric dipole moment (EDM) in a five dimensional SU(3)
    gauge-Higgs unification compactified on M^4 \times S^1/Z_2 space-time including
    a massive fermion. We point out that to realize the CP violation is a
    non-trivial task in the gauge-Higgs unification scenario and argue how the CP
    symmetry is broken spontaneously by the VEV of the Higgs, the extra space
    component of the gauge field. We emphasize the importance of the interplay
    between the VEV of the Higgs and the Z_2-odd bulk mass term to get physically
    the CP violation. We then calculate the one-loop contributions to the neutron
    EDM as the typical example of the CP violating observable and find that the EDM
    appears already at the one-loop level, without invoking to the three generation
    scheme. We then derive a lower bound for the compactification scale, which is
    around 2.6 TeV, by comparing the contribution due to the nonzero Kaluza-Klein
    modes with the experimental data.

    DOI: 10.1103/PhysRevD.80.055025

  • Meson-Nucleon Coupling from AdS/QCD Reviewed

    Nobuhito Maru, Motoi Tachibana

    Eur.Phys.J.C63:123-132,2009   2009.04

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    In this manuscript, a unified approach to hadron physics from holographic
    point of view is described. After introduction of a general setup for
    meson-nucleon system based on the bottom-up approach of QCD (AdS/QCD), as an
    illustration, we specifically examine meson-nucleon couplings. This is an
    example of the notion we call "holographic unification" in hadron physics.

    DOI: 10.1140/epjc/s10052-009-1096-x

  • The Universal Extra Dimensional Model with $S^2/Z_2$ extra-space Reviewed

    Nobuhito Maru, Takaaki Nomura, Joe Sato, Masato Yamanaka

    Nucl.Phys.B830:414-433,2010   2009.04

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    We propose a new Universal Extra Dimensional model that is defined on a
    six-dimensional spacetime which has a two-sphere orbifold $S^2/Z_2$ as an
    extra-space. We specify our model by choosing the gauge symmetry as
    SU(3)$\timesSU(2)\timesU(1)_Y \timesU(1)_X$, introducing field contents in
    six-dimensions as their zero modes correspond to the Standard model particles,
    and determining a boundary condition of these fields on orbifold $S^2/Z_2$. A
    background gauge field that belongs to U(1)$_X$ is introduced there, which is
    necessary to obtain massless chiral fermions in four-dimensional spacetime. We
    then analyze Kaluza-Klein(KK) mode expansion of the fields in our model and
    derive the mass spectrum of the KK particles. We find that the lightest KK
    particles are the 1st KK particle of massless gauge bosons at tree level. We
    also discuss the KK parity of the KK modes in our model and confirm the
    stability of the lightest KK particle which is important for dark matter
    physics.

    DOI: 10.1016/j.nuclphysb.2009.11.023

  • Calculable Violation of Gauge-Yukawa Universality and Top Quark Mass in the Gauge-Higgs Unification

    C. S. Lim, Nobuhito Maru

    2009.04

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We find that the one-loop correction to the ratio of Yukawa coupling and<br />
    gauge coupling in the gauge-Higgs unification, &quot;gauge-Yukawa universality<br />
    violation&quot;, is finite and calculable in any space-time dimension. Applying this<br />
    result to the ratio of top quark and W-boson masses, we show that the order one<br />
    correction required to generate a viable top quark mass is indeed possible if<br />
    the fermion embedding top quark belongs to the large dimensional representation<br />
    of the gauge group and a vacuum expectation value of Higgs scalar field is very<br />
    small comparing to the compactification scale.

  • More on the finiteness of the anomalous magnetic moment in the gauge-Higgs unification

    Yuki Adachi, C. S. Lim, Nobuhito Maru

    PHYSICAL REVIEW D   79 ( 7 )   2009.04( ISSN:2470-0010 ( eISSN:2470-0029

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We discuss the anomalous magnetic moment of fermion in a realistic SU(3) model of gauge-Higgs unification compactified on an orbifold S-1/Z(2) including Z(2)-odd bulk mass for fermions. An operator analysis implies that the anomalous magnetic moment should be finite and predictable, even though higher dimensional gauge theories are nonrenormalizable. Our main purpose is to clarify the cancellation mechanism of the UV divergences appearing in various types of Feynman diagrams. The cancellation of divergence turns out to take place between the contributions of the partners in the Higgs-like mechanism present in the nonzero Kaluza-Klein modes to form massive gauge bosons. It is also argued that the cancellation may be attributed to the quantum mechanical supersymmetry hidden in the scenario of gauge-Higgs unification.

    DOI: 10.1103/PhysRevD.79.075018

  • 30pVP-5 On the Finiteness of Anomalous Magnetic Moment in the Gauge-Higgs Unification Reviewed

    Adachi Y., Lim C. S., Maru N.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   21 - 21   2009.03( ISSN:1342-8349

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    CiNii Article

  • 30pVP-6 Anomalous magnetic moment in a realistic gauge-Higgs unification Reviewed

    Adachi Yuki, Lim C. S., Maru Nobuhito

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   22 - 22   2009.03( ISSN:1342-8349

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    CiNii Article

  • Finite gluon fusion amplitude in the gauge-Higgs unification

    Nobuhito Maru

    Modern Physics Letters A   23 ( 32 )   2737 - 2750   2008.10( ISSN:0217-7323

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We show that the gluon fusion amplitude in the gauge-Higgs unification scenario is finite in any dimension regardless of its nonrenormalizability. This result is supported by the fact that the local operator describing the gluon fusion process is forbidden by the higher dimensional gauge invariance. We explicitly calculate the gluon fusion amplitude in an arbitrary dimensional gauge-Higgs unification model and indeed obtain the finite result. © 2008 World Scientific Publishing Company.

    DOI: 10.1142/S0217732308028247

  • 20aSL-1 Physics of the Gauge-Higgs Unification Reviewed

    Maru N.

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   1 - 1   2008.08( ISSN:1342-8349

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    CiNii Article

  • 20aSL-8 Collider Physics of Gauge-Higgs Unification Models Reviewed

    Maru N., Okada N.

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   1 - 1   2008.08( ISSN:1342-8349

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    CiNii Article

  • Six-dimensional gauge-Higgs unification with an extra space S-2 and the hierarchy problem

    Chong-Sa Lim, Nobuhito Maru, K. Hasegawa

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77 ( 7 )   2008.07( ISSN:0031-9015

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We calculate one-loop radiative correction to the mass of Higgs identified with the extra space components of the gauge field in a six-dimensional massive scalar QED compactified on a two-sphere. The radiatively induced Higgs mass is explicitly shown to be finite for arbitrary bulk scalar mass M. Furthermore, the remaining finite part also turns out to vanish, at least for the case of small M, thus suggesting that the radiatively induced Higgs mass exactly vanishes, in general. The non-zero "Kaluza-Klein" modes in the gauge sector are argued to have a Higgs-like mechanism and quantum mechanical N = 2 supersymmetry, while the Higgs zero modes, as supersymmetric states, have a close relation with monopole configuration.

    DOI: 10.1143/JPSJ.77.074101

  • Finite Gluon Fusion Amplitude in the Gauge-Higgs Unification Reviewed

    Nobuhito Maru

    Mod.Phys.Lett.A23:2737-2750,2008   2008.03

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Kind of work:Single Work  

    We show that the gluon fusion amplitude in the gauge-Higgs unification
    scenario is finite in any dimension regardless of its nonrenormalizability.
    This result is supported by the fact that the local operator describing the
    gluon fusion process is forbidden by the higher dimensional gauge invariance.
    We explicitly calculate the gluon fusion amplitude in an arbitrary dimensional
    gauge-Higgs unification model and indeed obtain the finite result.

    DOI: 10.1142/S0217732308028247

  • Gauge-Higgs unification at CERN LHC

    Nobuhito Maru, Nobuchika Okada

    PHYSICAL REVIEW D   77 ( 5 )   2008.03( ISSN:2470-0010 ( eISSN:2470-0029

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    The Higgs boson production by the gluon fusion and its decay into two photons at the LHC are investigated in the context of the gauge-Higgs unification scenario. The qualitative behaviors for these processes in the gauge-Higgs unification are quite distinguishable from those of the standard model and the universal extra dimension scenario because of the overall sign difference for the effective couplings induced by one-loop corrections through the Kaluza-Klein modes. For the Kaluza-Klein mode mass smaller than 1 TeV, the Higgs production cross section and its branching ratio into two photons are sizably deviated from those in the standard model. Associated with the discovery of the Higgs boson, this deviation may be measured at the LHC.

    DOI: 10.1103/PhysRevD.77.055010

  • 26aZD-12 A Simple Model of Direct Gauge Mediation of Metastable SUSY Breaking Reviewed

    Haba N., Maru N.

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   15 - 15   2008.02( ISSN:1342-8349

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    CiNii Article

  • Towards A Realistic Grand Gauge-Higgs Unification Scenario Reviewed

    Nobuhito Maru

    AIPConf.Proc.1015:152-158,2008   2008.02

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Kind of work:Single Work  

    In this talk, we discuss an attempt to construct a realistic model of the
    grand gauge-Higgs unification. We investigate a 5D SU(6) grand gauge-Higgs
    unification model compactified on an orbifold S^1/Z_2. Ordinary quarks and
    leptons, together with right-handed neutrinos, are just accommodated into a
    minimal set of representations of the gauge group, without introducing any
    exotic states in the same representations. The proton decay turns out to be
    forbidden at least at the tree level. We also find a correct electroweak
    symmetry breaking SU(2)_L \times U(1)_Y \to U(1)_{em} is easily realized by
    introducing suitable number of adjoint fermions.

    DOI: 10.1063/1.2939048

  • Anomaly Mediation and Radius Stabilization by a Boundary Constant Superpotential in a Warped Space

    Nobuhito Maru, Norisuke Sakai, Nobuhiro Uekusa

    SUPERSYMMETRY AND THE UNIFICATION OF FUNDAMENTAL INTERACTIONS   1078   396 - +   2008( ISSN:0094-243X

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We present a very simple model of the radius stabilization in a supersymmetric (SUSY) Randall-Sundrum model with a hypermultiplet and a boundary constant superpotential. A wide range of parameters where the anomaly mediation of SUSY breaking is dominated is found although there are many problematic bulk effects of SUSY breaking. A negative cosmological constant in the radius stabilized vacuum can be cancelled by a localized SUSY breaking. Making use of this localized SUSY breaking also solves the mu-problem by Giudice-Masiero mechanism.

    DOI: 10.1063/1.3051971

  • Towards a realistic grand gauge-Higgs unification scenario

    Nobullito Maru

    GRAND UNIFIED THEORIES: CURRENT STATUS AND FUTURE PROSPECTS   1015   152 - 158   2008( ISSN:0094-243X

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    In this talk, we discuss an attempt to construct a realistic model of the grand gauge-Higgs unification. We investigate a 5D SU(6) grand gauge-Higgs unification model compactified on an orbifold S-1/Z(2). Ordinary quarks and leptons, together with right-banded neutrinos, are just accommodated into a minimal set of representations of the gauge group, without introducing any exotic states in the same representations. The proton decay turns out to be forbidden at least at the tree level. We also find a correct electroweak symmetry breaking SU(2)(L) x U(1)(Y)-&gt; U(1)(em) is easily realized by introducing suitable number of adjoint fermions.

    DOI: 10.1063/1.2939048

  • Two loop finiteness of Higgs mass and potential in the Gauge-Higgs unification Reviewed

    Yutaka Hosotani, Nobuhito Maru, Kazunori Takenaga, Toshifumi Yamashita

    Progress of Theoretical Physics   118 ( 6 )   1053 - 1068   2007.12( ISSN:0033-068X

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    The zero mode of an extra-dimensional component of gauge potentials serves as a 4D Higgs field in the gauge-Higgs unification. We examine QED on M 4 × S1 and determine the mass and potential of a 4D Higgs field (the A5, component) at the two loop level with gauge invariant regularization. It is seen that the mass is free from divergences and independent of the renormalization scheme.

    DOI: 10.1143/PTP.118.1053

  • Simple model of direct gauge mediation of metastable supersymmetry breaking

    Naoyuki Haba, Nobuhito Maru

    PHYSICAL REVIEW D   76 ( 11 )   2007.12( ISSN:1550-7998

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We construct a model of direct gauge mediation of metastable supersymmetry breaking by simply deforming the Intriligator, Seiberg, and Shih model in terms of a dual meson superpotential mass term. No extra matter field is introduced. The deformation explicitly breaks a U(1)(R) symmetry and pseudomoduli have a nonzero VEV at one-loop. Our metastable supersymmetry breaking vacuum turns out to be sufficiently long-lived. By gauging a subgroup of flavor symmetry, our model can directly couple to the standard model, which leads to nonvanishing gaugino mass generation. It is also shown that our model can evade the Landau pole problem. We show the parameters in the supersymmetry breaking sector are phenomenologically constrained.

    DOI: 10.1103/PhysRevD.76.115019

  • Two loop finiteness of Higgs mass and potential in the Gauge-Higgs unification

    Yutaka Hosotani, Nobuhito Maru, Kazunori Takenaga, Toshifumi Yamashita

    Progress of Theoretical Physics   118 ( 6 )   1053 - 1068   2007.12( ISSN:0033-068X

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    The zero mode of an extra-dimensional component of gauge potentials serves as a 4D Higgs field in the gauge-Higgs unification. We examine QED on M 4 × S1 and determine the mass and potential of a 4D Higgs field (the A5, component) at the two loop level with gauge invariant regularization. It is seen that the mass is free from divergences and independent of the renormalization scheme.

    DOI: 10.1143/PTP.118.1053

  • Gauge-Higgs Unification at LHC Reviewed

    Nobuhito Maru, Nobuchika Okada

    Phys.Rev.D77:055010,2008   2007.11

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    Higgs boson production by the gluon fusion and its decay into two photons at
    the LHC are investigated in the context of the gauge-Higgs unification
    scenario. The qualitative behaviors for these processes in the gauge-Higgs
    unification are quite distinguishable from those of the Standard Model and the
    universal extra dimension scenario because of the overall sign difference for
    the effective couplings induced by one-loop corrections through Kaluza-Klein
    (KK) modes. For the KK mode mass smaller than 1 TeV, the Higgs productions
    cross section and its branching ratio into two photons are sizably deviated
    from those in the Standard Model. Associated with the discovery of Higgs boson,
    this deviation may be measured at the LHC.

    DOI: 10.1103/PhysRevD.77.055010

  • Supersymmetry Breaking and Radius Stabilization by Constant Boundary Superpotentials in Warped Space

    Nobuhito Maru, Norisuke Sakai, Nobuhiro Uekusa

    Soryushiron Kenkyu Electronics   117 ( 1 )   A81   2007.10

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    Supersymmetry breaking and radius stabilization by constant superpotentials<br />
    localized at boundaries is studied in a supersymmetric warped space model where<br />
    a hypermultiplet, a compensator and a radion multiplet are taken into account.<br />
    Soft mass induced by the anomaly mediation can be of the order of 100GeV and<br />
    can be dominant compared to that mediated by bulk fields. A lighter physical<br />
    mode composed of the radion and the moduli can have mass of the order of a TeV<br />
    and the gravitino mass can be of the order of 10^7 GeV. The radius is<br />
    stabilized by the presence of the constant boundary superpotentials. We also<br />
    find that the mass splitting has an interesting dependence on the bulk mass<br />
    parameter c.

    DOI: 10.1103/PhysRevD.74.045017

    CiNii Article

  • Finite anomalous magnetic moment in the gauge-Higgs unification

    Yuki Adachi, C. S. Lim, Nobuhito Maru

    PHYSICAL REVIEW D   76 ( 7 )   2007.10( ISSN:1550-7998

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We show that the anomalous magnetic moment of fermion in the gauge-Higgs unification is finite in any spacetime dimensions, which is a new predictive physical observable similar to the Higgs mass.

    DOI: 10.1103/PhysRevD.76.075009

  • 21pYB-2 Finite Anomalous Magnetic Moment in the Gauge-Higgs Unification Reviewed

    Adachi Yuki, Lim C.S., Maru Nobuhito

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   5 - 5   2007.08( ISSN:1342-8349

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    CiNii Article

  • 21pYB-5 Calculable one-loop contributions to S and T parameters in the gauge-Higgs unification Reviewed

    Maru Nobuhito

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   6 - 6   2007.08( ISSN:1342-8349

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    CiNii Article

  • Finite Anomalous Magnetic Moment in the Gauge-Higgs Unification Reviewed

    Yuki Adachi, C. S. Lim, Nobuhito Maru

    Phys.Rev.D76:075009,2007   2007.07

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    We show that the anomalous magnetic moment of fermion in the gauge-Higgs
    unification is finite in any spacetime dimensions, which is a new predictive
    physical observable similar to the Higgs mass.

    DOI: 10.1103/PhysRevD.76.075009

  • Calculable one-loop contributions to S and T parameters in the gauge-Higgs unification

    C. S. Lim, Nobuhito Maru

    Physical Review D - Particles, Fields, Gravitation and Cosmology   75 ( 11 )   2007.06( ISSN:1550-7998

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We investigate the one-loop contributions to S and T oblique parameters in gauge-Higgs unification. We show that these parameters are finite in five dimensional space-time, but are divergent in more than five dimensions. Remarkably, however, we find that a particular linear combination of S and T parameters, S-4cos θWT, becomes finite for six dimensional space-time, though each of these parameters are divergent. This is because, in the gauge-Higgs unification scenario, the operators relevant for S and T parameters are not independent, but are included in a unique higher dimensional gauge invariant operator. Thus the predictable linear combination is model independent, irrespective of the detail of the matter content. © 2007 The American Physical Society.

    DOI: 10.1103/PhysRevD.75.115011

  • Towards A Realistic Grand Gauge-Higgs Unification Reviewed

    C. S. Lim, Nobuhito Maru

    Phys.Lett.B653:320-324,2007   2007.06

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    We investigate a 5D SU(6) grand gauge-Higgs unification model compactified on
    an orbifold S^1/Z_2. Ordinary quarks and leptons, together with right-handed
    neutrinos, are just accommodated into a minimal set of representations of the
    gauge group, without introducing any exotic states. The proton decay turns out
    to be forbidden at least at the tree level. We also find a correct electroweak
    symmetry breaking SU(2)_L \times U(1)_Y \to U(1)_{em} is easily realized by
    introducing suitable number of adjoint fermions.

    DOI: 10.1016/j.physletb.2007.07.053

  • Towards A Realistic Grand Gauge-Higgs Unification

    C. S. Lim, Nobuhito Maru

    Phys.Lett.B653:320-324,2007   2007.06

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We investigate a 5D SU(6) grand gauge-Higgs unification model compactified on<br />
    an orbifold S^1/Z_2. Ordinary quarks and leptons, together with right-handed<br />
    neutrinos, are just accommodated into a minimal set of representations of the<br />
    gauge group, without introducing any exotic states. The proton decay turns out<br />
    to be forbidden at least at the tree level. We also find a correct electroweak<br />
    symmetry breaking SU(2)_L \times U(1)_Y \to U(1)_{em} is easily realized by<br />
    introducing suitable number of adjoint fermions.

    DOI: 10.1016/j.physletb.2007.07.053

  • Radius stabilization by constant boundary superpotentials in warped space

    Nobuhito Maru, Norisuke Sakai, Nobuhiro Uekusa

    PHYSICAL REVIEW D   75 ( 12 )   2007.06( ISSN:2470-0010 ( eISSN:2470-0029

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    A warped space model with a constant boundary superpotential has been an efficient model both to break supersymmetry and to stabilize the radius, when a hypermultiplet, a compensator, and a radion multiplet are taken into account. In such a model of radius stabilization, the radion and moduli masses, the gravitino mass, and the induced soft masses are studied. We find that a lighter physical mode composed of the radion and the moduli can have mass of the order of a TeV and that the gravitino mass can be of the order of 10(7) GeV. It is also shown that soft mass induced by the anomaly mediation can be of the order of 100 GeV and can be dominant compared to that mediated by bulk fields. Localized F-terms and D-terms are discussed as candidates for canceling the cosmological constant. We find that there is no flavor changing neutral current problem in a wide range of parameters.

    DOI: 10.1103/PhysRevD.75.125014

  • Structure of S and T Parameters in Gauge-Higgs Unification

    C. S. Lim, Nobuhito Maru

    ( 328 )   45 - 49   2007.03( ISSN:0386-2895

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We investigate the divergence structure of one-loop corrections to S and T<br />
    parameteres in gauge-Higgs unification. We show that these parameters are<br />
    finite in five dimensions, but divergent in more than five dimensions.<br />
    Remarkably, a particular linear combination of S and T parameters becomes<br />
    finite in six dimension case, which is indicated from the operator analysis in<br />
    a model independent way.

    DOI: 10.1142/9789812790750_0039

    CiNii Article

  • Two-loop calculation of Higgs mass in gauge-Higgs unification: 5D massless QED compactified on S(1)

    Nobuhito Maru, Toshifumi Yamashita

    NUCLEAR PHYSICS B   754 ( 1-2 )   127 - 145   2006.10( ISSN:0550-3213

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We calculate the quantum corrections to the mass of the zero mode of the fifth component of the gauge field at two-loop level in a five-dimensional massless QED compactified on S(1). We discuss in detail how the divergences are exactly canceled and the mass becomes finite. The key ingredients to obtain the result are the shift symmetry and the Ward-Takahashi identity. We also evaluate the finite part of corrections. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.nuclphysb.2006.07.023

  • Supersymmetry breaking by constant boundary superpotentials in warped space

    Nobuhito Maru, Norisuke Sakai, Nobuhiro Uekusa

    PHYSICAL REVIEW D   74 ( 4 )   2006.08( ISSN:2470-0010 ( eISSN:2470-0029

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    Supersymmetry breaking by constant (field independent) superpotentials localized at boundaries is studied in a supersymmetric warped space model. We calculate the Kaluza-Klein mass spectrum of the hypermultiplet. We take into account of the radion and the compensator supermultiplets, as well as the bulk mass c for the hypermultiplet. The mass splitting is similar to that of the Scherk-Schwarz supersymmetry breaking (in flat space) for large vertical bar c vertical bar, and has an interesting dependence on the bulk mass parameter c. We show that the radius is stabilized by the presence of the constant boundary superpotentials.

    DOI: 10.1103/PhysRevD.74.045017

  • Bulk Mass Effects in Gauge-Higgs Unification at Finite Temperature Reviewed

    Nobuhito Maru, Kazunori Takenaga

    Phys.Rev. D74 (2006) 015017   2006.06

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    We study the bulk mass effects on the electroweak phase transition at finite
    temperature in a five dimensional SU(3) gauge-Higgs unification model on an
    orbifold. We investigate whether the Higgs mass satisfying the experimental
    lower bound can be compatible with the strong first order phase transition
    necessary for a successful electroweak baryogenesis. Our numerical results show
    that the above statement can be realized by matter with bulk mass yielding a
    viable Higgs mass. We also find an interesting case where the heavier Higgs
    gives the stronger first order phase transition.

    DOI: 10.1103/PhysRevD.74.015017

  • Effects of bulk mass in gauge-Higgs unification

    Nobuhito Mam, Kazunori Takenaga

    PHYSICS LETTERS B   637 ( 4-5 )   287 - 294   2006.06( ISSN:0370-2693

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We study effects of bulk mass on electroweak symmetry breaking and Higgs mass in the scenario of five-dimensional SU(3) gauge-Higgs unification defined on M(4) x S(1)/Z(2). The asymptotic form of effective potential for the Higgs field is obtained, from which a transparent and useful expression for the Higgs mass is found. The small vacuum expectation values (VEV) for Higgs field can be realized by choosing bulk mass parameters appropriately for a fixed set of matter content. The bulk mass for periodic fermion field, in general, has effects to make the Higgs mass less heavy. On the other hand, the bulk mass for antiperiodic field does not directly affect the Higgs mass, but it contributes to increase or decrease the Higgs mass, depending on how small the VEV is induced due to the antiperiodic field. We give numerical examples to confirm these effects, in which the role of the bulk mass is also definitely clear. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physletb.2006.04.044

  • Effects of Bulk Mass in Gauge-Higgs Unification Reviewed

    Nobuhito Maru, Kazunori Takenaga

    Phys.Lett. B637 (2006) 287-294   2006.02

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    We study effects of bulk mass on electroweak symmetry breaking and Higgs mass
    in the scenario of five dimensional SU(3) gauge-Higgs unification defined on
    M^4\times S^1/Z_2. The asymptotic form of effective potential for the Higgs
    field is obtained, from which a transparent and useful expression for the Higgs
    mass is found. The small vacuum expectation values (VEV) for Higgs field can be
    realized by choosing bulk mass parameters approriately for a fixed set of
    matter content. The bulk mass for periodic fermion field, in general, has
    effects to make the Higgs mass less heavy. On the other hand, the bulk mass for
    antiperiodic field does not directly affect the Higgs mass, but it contributes
    to increase or decrease the Higgs mass, depending on how small the VEV is
    induced due to the antiperiodic field. We give numerical examples to confirm
    these effects, in which the role of the bulk mass is also definitely clear.

    DOI: 10.1016/j.physletb.2006.04.044

  • Holographic model for hadrons in deformed AdS(5) background

    K Ghoroku, N Maru, M Tachibana, M Yahiro

    PHYSICS LETTERS B   633 ( 4-5 )   602 - 606   2006.02( ISSN:0370-2693 ( eISSN:1873-2445

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    Several physical quantities of light hadrons are examined by a new holographic model of QCD, which is the modified version of the one proposed by Erlich et al. defined on AdS(5). In our model, AdS(5) is deformed by a non-trivial bulk scalar, this is corresponding to adding the mass term of the adjoint fermions to the 4d SYM theory dual to the gravity on AdS(5). We find that this deformation should be taken to be rather small, but its important effects are also seen. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physletb.2005.12.004

  • Bulk mass effects in gauge-Higgs unification at finite temperature

    Nobuhito Maru, Kazunori Takenaga

    Physical Review D - Particles, Fields, Gravitation and Cosmology   74 ( 1 )   2006( ISSN:1550-7998

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We study the bulk mass effects on the electroweak phase transition at finite temperature in a five-dimensional SU(3) gauge-Higgs unification model on an orbifold. We investigate whether the Higgs mass satisfying the experimental lower bound can be compatible with the strong first order phase transition necessary for a successful electroweak baryogenesis. Our numerical results show that the above statement can be realized by matter with bulk mass yielding a viable Higgs mass. We also find an interesting case where the heavier Higgs gives the stronger first order phase transition. © 2006 The American Physical Society.

    DOI: 10.1103/PhysRevD.74.015017

  • Holographic Model for Hadrons in Deformed AdS5 Background Reviewed

    Kazuo Ghoroku, Nobuhito Maru, Motoi Tachibana, Masanobu Yahiro

    Phys.Lett. B633 (2006) 602-606   2005.10

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    Several physical quantities of light hadrons are examined by a new
    holographic model of QCD, which is the modified version of the one proposed by
    Erlich et al. defined on AdS${}_5$. In our model, AdS${}_5$ is deformed by a
    non-trivial bulk scalar, this is corresponding to adding the mass term of the
    adjoint fermions to the 4d SYM theory dual to the gravity on AdS${}_5$. We find
    that this deformation should be taken to be rather small, but its important
    effects are also seen.

    DOI: 10.1016/j.physletb.2005.12.004

  • 14pSH-1 Gauge-Higgs Unification at Finite Temperature Reviewed

    Maru N., Takenaga K.

    Meeting abstracts of the Physical Society of Japan   60 ( 2 )   6 - 6   2005.08( ISSN:1342-8349

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    CiNii Article

  • Color superconductivity from supersymmetry

    Nobuhito Maru, Motoi Tachibana

    Modern Physics Letters A   20 ( 20 )   1495 - 1502   2005.06( ISSN:0217-7323

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    A supersymmetric composite model of color superconductivity is proposed. Quarks and diquarks are dynamically generated as composite fields by a newly introduced strong gauge dynamics. It is shown that the condensation of the scalar component of the diquark supermultiplet occurs when the chemical potential becomes larger than some critical value. We believe that the model captures well the aspects of the diquark condensate behavior and helps in understanding the diquark dynamics in real QCD. The results obtained here might be useful when we consider a theory composed of quarks and diquarks. © World Scientific Publishing Company.

    DOI: 10.1142/S021773230501786X

  • Aspects of Phase Transition in Gauge-Higgs Unification at Finite Temperature

    Nobuhito Maru, Kazunori Takenaga

    Phys.Rev.D72:046003,2005   2005.05

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    We study the phase transition in gauge-Higgs unification at finite<br />
    temperature. In particular, we obtain the strong first order electroweak phase<br />
    transition for a simple matter content yielding the correct order of Higgs mass<br />
    at zero temperature. Two stage phase transition is found for a particular<br />
    matter content, which is the strong first order at each stage. We further study<br />
    supersymmetric gauge models with the Scherk-Schwarz supersymmetry breaking. We<br />
    again observe the first order electroweak phase transition and multi stage<br />
    phase transition.

    DOI: 10.1103/PhysRevD.72.046003

  • Yukawa coupling structure in intersecting D-brane models Reviewed

    N Kitazawa, T Kobayashi, N Maru, N Okada

    SPRINGER EUROPEAN PHYSICAL JOURNAL C   40 ( 4 )   579 - 587   2005.04( ISSN:1434-6044

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    The structure of Yukawa coupling matrices is investigated in type IIA T-6/(Z(2) x Z(2)) orientifold models with intersecting D-branes. Yukawa coupling matrices are difficult to be made realistic in conventional models in which the generation structure emerges by the multiple intersection of D-branes in the factorized T-6 = T-2 x T-2 x T-2. We study the new type of favor structure, where Yukawa couplings are dynamically generated, and show this type of models lead to non-trivial structures of Yukawa coupling matrices, which can be realistic.

    DOI: 10.1140/epjc/s2005-02166-4

  • Yukawa coupling structure in intersecting D-brane models

    N Kitazawa, T Kobayashi, N Maru, N Okada

    EUROPEAN PHYSICAL JOURNAL C   40 ( 4 )   579 - 587   2005.04( ISSN:1434-6044

     More details

    Publishing type:Internal/External technical report, pre-print, etc.  

    The structure of Yukawa coupling matrices is investigated in type IIA T-6/(Z(2) x Z(2)) orientifold models with intersecting D-branes. Yukawa coupling matrices are difficult to be made realistic in conventional models in which the generation structure emerges by the multiple intersection of D-branes in the factorized T-6 = T-2 x T-2 x T-2. We study the new type of favor structure, where Yukawa couplings are dynamically generated, and show this type of models lead to non-trivial structures of Yukawa coupling matrices, which can be realistic.

    DOI: 10.1140/epjc/s2005-02166-4

  • 25aXE-7 Color Superconductivity from Supersymmetry Reviewed

    Maru N., Tachibana M.

    Meeting abstracts of the Physical Society of Japan   60 ( 1 )   7 - 7   2005.03( ISSN:1342-8349

     More details

    Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    A supersymmetric composite model of color superconductivity is proposed.
    Quarks and diquarks are dynamically generated as composite fields by a newly
    introduced strong gauge dynamics. It is shown that the condensation of the
    scalar component of the diquark supermultiplet occurs when the chemical
    potential becomes larger than some critical value. We believe that the model
    well captures aspects of the diquark condensate behavior and helps our
    understanding of the diquark dynamics in real QCD. The results obtained here
    might be useful when we consider a theory composed of quarks and diquarks.

    DOI: 10.1142/S021773230501786X

    CiNii Article

    Other URL: http://arxiv.org/pdf/hep-ph/0411079v2

▼display all

Grant-in-Aid for Scientific Research

  • ゲージ・ヒッグス統一模型からの宇宙物理への予言とプランクスケール物理への拡張

    Grant-in-Aid for Scientific Research(C)  2017.04

  • ゲージ・ヒッグス統一模型におけるフレーバー物理の研究

    Grant-in-Aid for Scientific Research(C)  2012.04

Other subsidies, etc.

  • 超対称ゲージ理論の非摂動力学と素粒子モデル

    未設定  2000.04

  • 超対称ゲージ理論の非摂動ダイナミックスと素粒子モデル

    未設定  1998.04

Outline of education staff

  • 今年度は、共通教育では物理実験、専門教育では量子力学講義・演習、大学院教育では場の量子論、素粒子論講義を担当している。

Charge of on-campus class subject

  • 素粒子論

    2020     Graduate school

  • 場の量子論

    2020     Graduate school

  • 電磁気学とその演習I

    2020     Undergraduate

  • 量子力学I演習

    2020     Undergraduate

  • 量子力学I

    2020     Undergraduate

  • 素粒子論

    2019     Graduate school

  • 場の量子論

    2019     Graduate school

  • 電磁気学とその演習I

    2019     Undergraduate

  • 量子力学I演習

    2019     Undergraduate

  • 量子力学I

    2019     Undergraduate

  • 量子力学I演習

    2018     Undergraduate

  • 量子力学I

    2018     Undergraduate

  • 場の量子論

    2018     Graduate school

  • 素粒子論

    2018     Graduate school

  • 電磁気学とその演習1

    2018     Undergraduate

  • 素粒子論

    2017     Graduate school

  • 場の量子論

    2017     Graduate school

  • 量子力学I

    2017     Undergraduate

  • 量子力学I演習

    2017     Undergraduate

  • 電磁気学とその演習1

    2017     Undergraduate

  • 場の量子論

    2016    

  • 素粒子論

    2016    

  • 量子力学I

    2016     Undergraduate

  • 量子力学I演習

    2016     Undergraduate

  • 基礎物理学実験I

    2016     Undergraduate

  • 場の量子論

    2015    

  • 素粒子論

    2015    

  • 基礎物理学実験I

    2015     Undergraduate

  • 基礎物理学II-E

    2015     Undergraduate

  • 場の量子論

    2014    

  • 素粒子論

    2014    

  • 基礎物理学実験I

    2014     Undergraduate

  • 基礎物理学II-E

    2014     Undergraduate

  • 基礎物理学実験I

    2013     Undergraduate

  • 基礎物理学II-E

    2013     Undergraduate

▼display all

Charge of off-campus class subject

  • Quantum Mechanics 3 Exercises

    2020.04
    -
    2020.08
    Institution:Osaka City University

  • 微分積分学

    Institution:Juntendo University

  • 線型代数学

    Institution:Juntendo University

  • 物理実験1,2

  • 基礎数学

    Institution:Juntendo University

  • 物理実験1,2

  • 微分積分学

    Institution:Juntendo University

  • 場の量子論講義

    Institution:Osaka City University

  • 基礎物理学実験I

    Institution:Osaka City University

  • 基礎物理学II-E

    Institution:Osaka City University

  • 素粒子論ゼミ

    Institution:Osaka City University

  • 素粒子論講義

    Institution:Osaka City University

  • 線型代数学

    Institution:Juntendo University

  • 量子力学I講義、演習

    Institution:Osaka City University

  • 電磁気学とその演習1

    Institution:Osaka City University

▼display all

Social Activities

  • ふしぎな量子の世界

    Role(s): Lecturer

    大阪公立大学 市民セミナー「21世紀の物理学 2022」  2022.11

     More details

    Type:Lecture

  • 異次元ワールドへのお誘い

    Role(s): Lecturer

    大阪府立いちりつ高等学校 出張講義  2022.09

     More details

    Type:Visiting lecture

  • ゲージヒッグス統合理論の現状と今後の展望

    Role(s): Lecturer

    第68回原子核三者若手夏の学校  2022.08

     More details

    Type:Seminar, workshop

  • 異次元ワールドへのお誘い

    Role(s): Lecturer

    奈良市立一条高等学校  2021.10

     More details

    Type:Visiting lecture

  • 異次元ワールドへのお誘い

    Role(s): Lecturer

    大阪市立東高等学校  2021.07

     More details

    Type:Visiting lecture

  • 南部陽一郎生誕100周年記念 企画展示「ほがらかに」ノーベル物理学賞受賞者 南部陽一郎の人生と研究 主催

    Role(s): Planner

    大阪市立大学、大阪市科学館  2021.01 - 2021.03

  • 南部陽一郎物理学研究所 オンライン市民講演

    Role(s): Lecturer

    大阪市立大学 南部陽一郎物理学研究所  2020.12

  • 異次元ワールドへのお誘い

    Role(s): Lecturer

    大阪市立大学広報 (和歌山親愛高等学校)  2018.11

     More details

    Type:Visiting lecture

  • 素粒子物理が解き明かす質量の起源

    Role(s): Lecturer

    朝日新聞社  朝日新聞社「プロフェッサービジット」企画出張講義(熊本学園大学付属高等学校)  2018.10

     More details

    Type:Visiting lecture

  • 異次元ワールドへのお誘い

    Role(s): Lecturer

    西宮高校  2018.09

     More details

    Type:Visiting lecture

  • 異次元ワールドへのお誘い

    Role(s): Lecturer

    大阪市立大学  オープンキャンパス  2018.08

     More details

    Type:Other

  • 素粒子の質量生成の謎に迫るヒッグス粒子

    Role(s): Lecturer

    日本物理学会大阪支部  公開シンポジウム 「量子力学90年」  2017.12

     More details

    Type:Visiting lecture

  • 素粒子の質量生成の謎に迫るヒッグス粒子

    Role(s): Lecturer

    天王寺高等学校  2017.12

     More details

    Type:Visiting lecture

  • 松江南高等学校 研究室見学

    2016.10

  • 一般向け教育活動

    2016.04 - 2017.03

     More details

    大阪府高齢者大学校@大阪市教育会館 宇宙と生命の神秘に遭遇する科 連続講義「素粒子の世界」

  • 小中高生向け教育活動

    2016.04 - 2017.03

     More details

    夢ナビライブ2016大阪会場 ミニ講義「物理学からの異次元ワールドへのお誘い」

  • 小中高生向け教育活動

    2016.04 - 2017.03

     More details

    第11回大阪の大学「学び」フェア@近畿大学 模擬講義「ニュートリノ振動ってなんだろう?」

  • 素粒子の世界

    Role(s): Lecturer

    大阪府高齢者大学校  2016 - Now

     More details

    Type:Visiting lecture

  • 我々の宇宙は4次元なのか?ー隠れた異次元空間のおはなしー

    Role(s): Lecturer

    大阪市立大学、大阪市立科学館、 (公財)大阪科学振興協会、中之島科学研究所 日本天文学会  七夕講演会  2015.07

     More details

    Type:Visiting lecture

  • 小中高生向け教育活動

    2015.04 - 2016.03

     More details

    夢ナビライブ2015大阪会場
    ミニ講義「物理学からの異次元ワールドへのお誘い」

  • 小中高生向け教育活動

    2015.04 - 2016.03

     More details

    全国同時七夕講演会「我々の宇宙は4次元なのか?ー隠れた異次元空間のおはなしー」

  • マスメディア活動

    2015.04 - 2016.03

     More details

    本学特別栄誉教授 南部陽一郎先生 追悼記事 産經新聞7/18 朝刊掲載

  • その他活動

    2015.04 - 2016.03

     More details

    素粒子論グループ 素粒子論委員

  • 物理学からの異次元ワールドへのお誘い

    Role(s): Performer

    frompage  夢ナビ講義ライブ  2015

     More details

    Type:Visiting lecture

  • 小中高生向け教育活動

    2014.04 - 2015.03

     More details

    SSH大手前高校サイエンス探究中間発表会 講評

  • 一般向け教育活動

    2014.04 - 2015.03

     More details

    大阪私学数学教育研究会 春期講演会 @大阪府私学教育文化会館
    「質量の起源:ヒッグス粒子とは何か?」

  • 小中高生向け教育活動

    2014.04 - 2015.03

     More details

    SSH大手前高校サイエンス探究発表会 講評

  • その他活動

    2014.04 - 2015.03

     More details

    素粒子論グループ 素粒子論委員

  • 質量の起源:ヒッグス粒子とは何か?

    Role(s): Performer

    大阪私学数学教育研究会 春期講演会  2014

     More details

    Type:Lecture

  • 世紀の大発見!! ヒッグス粒子って何だろう?

    Role(s): Performer

    福島工業高等専門学校  2014

     More details

    Type:Visiting lecture

  • 小中高生向け教育活動

    2013.04 - 2014.03

     More details

    SSH大手前高校サイエンス探究中間発表会 講評

  • SSH大手前高校サイエンス探究中間発表会 講評

    Role(s): Consultant

     More details

    Type:Research consultation

▼display all

Media Coverage

  • 「プロフェッサービジット」企画出張講義 Newspaper, magazine

    朝日新聞社  朝日新聞  2019.01

  • Researchers Promotional material

    大阪市立大学広報  2018.10

  • 南部陽一郎先生追悼 Newspaper, magazine

    産經新聞  2015