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International Workshop on Grand Unified Theories: Current Status and Future Prospects

17โ€“19 Dec 2007
Ritsumeikan University
Europe/Zurich timezone

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Contribution List

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  1. 55. Welcome to Ritsumeikan University
    17/12/2007, 09:00
  2. 56. Scope of Workshop and Organization questions
    Prof. Takeshi Fukuyama (Ritsumeikan University)
    17/12/2007, 09:05
  3. 57. Does the extra dimension rescue the SO(10) GUT?
    Prof. Takeshi Fukuyama (Ritsumeikan University)
    17/12/2007, 09:20
  4. 58. Review of phenomenological models
    Dr Koichi Matsuda (Tsinghua University)
    17/12/2007, 10:10
  5. 59. Discrete Gauge Symmetries and Proton Stability in grand unified theories
    Prof. Rabindra. N. Mohapatra (University of Maryland)
    17/12/2007, 11:00
    We discuss the results of a search for anomaly free Abelian Z_N discrete symmetries that lead to automatic R-parity conservation and prevents dangerous higher-dimensional proton decay operators in simple extensions of the minimal supersymmetric extension of the standard model (MSSM) based on the left-right symmetric group, the Pati-Salam group and SO(10). We require that the superpotential for...
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  6. 60. B-aniti-B mixing and lepton flavor violation in supersymmetric grand unified models
    Dr Yukihiro Mimura (Texas A&M University)
    17/12/2007, 11:50
    We study B-anti-B mixing in grand unified SO(10), SU(5) models where the mixings among the second and third generation squarks arise due to the existence of flavor violating sources in the Dirac and Majorana couplings which are responsible for neutrino mixings. We find that when the branching ratio of tau->mu gamma decay is enhanced to be around the current experimental bound, B_s-anti-B...
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  7. 87. Unparticle Dark Matter
    Dr Tatsuru Kikuchi (KEK)
    17/12/2007, 12:10
    Once a parity is introduced in unparticle physics, under which unparticle provided in a hidden conformal sector is odd while all Standard Model particles are even, unparticle can be a suitable candidate for the cold dark matter (CDM) in the present universe through its coupling to the Standard Model Higgs doublet. We find that for Higgs boson mass in the range, 114.4 GeV < m_h < 250 GeV, the...
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  8. 61. Differentiating Neutrino Models on the Basis of the Reactor Angle and Lepton Flavor Violation
    Prof. Carl. H. Albright (Northern Illinois University and Fermilab)
    17/12/2007, 14:00
    An earlier survey of viable neutrino mass and mixng models revealed a broad spectrum of predicted valies for sin^2 (theta_13) ranging fom the present upper bound of 0.04 accessible to the next round of reactor neutrino experiments down to values less than 0.001 requiring a neutrino factory for observation. Here we single out models with similar theta _13 predictions ad show that the viability...
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  9. 62. Nucleon sigma term from lattice QCD
    Prof. Tetsuya Onogi (YITP, Kyoto University)
    17/12/2007, 14:50
    There has been renewed interest in the nucleon sigma term - the scalar form factor of the nucleon at zero recoil- since it determines the dark matter reaction rate with nucleon through the t-channel Higgs boson exchange. Despite its importance and its long history of theoretical studies, there are still substantial uncertanties. We present our recent studies of the nucleon sigma term based on...
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  10. 64. Proton decay in SO(10) with stabilized doublet-triplet splitting
    Prof. Kaladi. S. Babu (Oklahoma State University)
    17/12/2007, 16:10
  11. 92. New Physics in Colliders
    Dr Nobuchika Okada (KEK)
    17/12/2007, 17:00
  12. 86. How to Evade a NO-GO Theorem in Flavor Symmetries
    Prof. Yoshio Koide (Osaka University)
    17/12/2007, 17:50
    We may expect that an approach based on symmetries will be a powerfulinstrument for investigating the origin of the flavors. However, when we want to introduce a symmetry (discrete one, U(1), and any others) into our mass matrix model, we always encounter an obstacle, the so-called No-Go theorem in flavor symmetries (YK, Phys.Rev. D71 (2005) 016010). In the present talk, I would like to talk...
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  13. 91. Family Symmetry and GUTs
    Prof. Steve. F. King (University of Southampton)
    18/12/2007, 09:00
  14. 66. Proton Decay and Flavor Violating Thresholds in SO(10) Models
    Dr Yukihiro Mimura (Texas A&M University)
    18/12/2007, 09:50
    Discovery of neutrino mass has put the spotlight on supersymmetric SO(10) as a natural candidate for grand unification of forces and matter. However, the suppression of proton decay is a major problem in any supersymmetric grand unified models. In this paper we show how to alleviate this problem by simple threshold effect which raises the colored Higgsino masses and the grand unification scale...
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  15. 68. String compactification and unification of forces
    Prof. Jihn. E. Kim (Seoul National University)
    18/12/2007, 11:10
  16. 69. Three family GUT-like models from heterotic string
    Mr Kei-Jiro Takahash (Kyoto University)
    18/12/2007, 12:00
    We recently developed string compactification on non-factorizable orbifold. Especially in E8xE8 Heterotic string, we obtain SU(5) and SO(10) GUT-like models with simple assumptions. These models have simple spectra including three generations of matter and messenger-like sectors.
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  17. 70. CP and SUSY breaking and E6 GUT
    Prof. Nobuhiro Maekawa (Nagoya University)
    18/12/2007, 14:00
  18. 71. Scalar non-degeneracy and flavor unification
    Mr Kentaro Kojima (Kyusyu University)
    18/12/2007, 14:50
    A general consequence of GUT is unification of flavor. It is shown that the non-degeneracy of scalar superparticles provides a direct imprint of flavor structure in high-energy fundamental theory.
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  19. 73. Gauge-Higgs Unification
    Prof. Yutaka Hosotani (Osaka University)
    18/12/2007, 15:40
  20. 74. Towards a Realistic Grand Gauge-Higgs Unification
    Dr Nobuhito Maru (Kobe University)
    18/12/2007, 16:30
    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...
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  21. 75. Search for a realistic orbifold grand unification
    Prof. Yoshiharu Kawamura (Shinshu University)
    18/12/2007, 16:50
  22. 85. Building a model by coset space dimensional reduction using 10 dimensional coset spaces
    Mr Takaaki Nomura (Saitama University)
    18/12/2007, 17:40
    Most of the free parameters in the SM are contained in the Higgs potential terms and the Yukawa coupling terms, i.e the Higgs associated terms. This fact suggests that if the origin of the Higgs particle results in a more fundamental model, this model would be described by fewer free parameters. One of the candidates of the model that gives origin of the Higgs particles is a gauge-Higgs...
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  23. 89. Gauge unification in 5-D SU(5) model with orbifold breaking of GUT symmetry
    Prof. Biswajoy Brahmachari (Vidyasagae Evening College)
    18/12/2007, 18:00
    We consider a 5-dimensional SU(5) model wherein the symmetry is broken to the 4-dimensional Standard Model by compactification of the 5th dimension on an S^1/(Z_2 imes Z^prime_2) orbifold. We identify the members of all SU(5) representations upto 75 which have zero modes. We examine how these light scalars affect gauge coupling unification assuming a single intermediate scale and present...
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  24. 77. Probing Unification Scale Physics at TeV-scale Collider Experiments
    Prof. Hitoshi Murayama (University of California, Berkeley and Institute for the Physics and Mathematics of the Universe, University of Tokyo)
    19/12/2007, 09:00
    Grand Unification and seesaw mechanism of neutrino mass are physics at extremely high energies, which may not allow for direct experimental tests. Here I will discuss how we may obtain information about such extreme high energy physics based on TeV-scale collider data, such as LHC and ILC.
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  25. 76. Higgsless breaking of Grand Unification
    Dr Toshifumi Yamashita (Osaka University)
    19/12/2007, 09:50
    We consider a possibility of higgsless breaking of the grand unified symmetry. In contrast with the orbifold breaking, the rank can be reduced in this breaking. We apply this breaking to a 5D SO(10) model.
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  26. 84. A three Site Higgsless Model
    Dr Masafumi Kurachi (YITP, Kyoto University)
    19/12/2007, 10:10
  27. 78. SUSY and Cosmology -- inflation, gravitino, and axion
    Prof. Masahiro Kawasaki (ICRR, University of Tokyo)
    19/12/2007, 11:00
  28. 88. Inflation and Unification
    Prof. Qaisar Shafi (Bartol Research Institute and Delaware University)
    19/12/2007, 11:50
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    Prof. Qaisar Shafi (Bartol Research Institute and Delaware University)
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  57. 67. Can the extra dimension rescue the SO(10) GUT?
    Prof. Takeshi Fukuyama (Ritsumeikan University)
  58. 83. discussion
  59. 90. Gauge unification in 5-D SU(5) model with orbifold breaking of GUT symmetry
    Prof. Biswajoy Brahmachari (Vidyasagae Evening College)
    We consider a 5-dimensional SU(5) model wherein the symmetry is broken to the 4-dimensional Standard Model by compactification of the 5th dimension on an S^1/(Z_2 imes Z^prime_2) orbifold. We identify the members of all SU(5) representations upto 75 which have zero modes. We examine how these light scalars affect gauge coupling unification assuming a single intermediate scale and present...
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  60. 65. New Physics in Colliders
    Dr Nobuchika Okada (KEK)