Prof.
Takeshi Fukuyama
(Ritsumeikan University)
12/17/07, 9:05 AM
Prof.
Takeshi Fukuyama
(Ritsumeikan University)
12/17/07, 9:20 AM
Dr
Koichi Matsuda
(Tsinghua University)
12/17/07, 10:10 AM
Prof.
Rabindra. N. Mohapatra
(University of Maryland)
12/17/07, 11:00 AM
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...
Dr
Yukihiro Mimura
(Texas A&M University)
12/17/07, 11:50 AM
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...
Prof.
Carl. H. Albright
(Northern Illinois University and Fermilab)
12/17/07, 2:00 PM
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...
Prof.
Tetsuya Onogi
(YITP, Kyoto University)
12/17/07, 2:50 PM
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...
Prof.
Kaladi. S. Babu
(Oklahoma State University)
12/17/07, 4:10 PM
Prof.
Yoshio Koide
(Osaka University)
12/17/07, 5:50 PM
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...
Prof.
Steve. F. King
(University of Southampton)
12/18/07, 9:00 AM
Dr
Yukihiro Mimura
(Texas A&M University)
12/18/07, 9:50 AM
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...
Prof.
Jihn. E. Kim
(Seoul National University)
12/18/07, 11:10 AM
Mr
Kei-Jiro Takahash
(Kyoto University)
12/18/07, 12:00 PM
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.
Prof.
Nobuhiro Maekawa
(Nagoya University)
12/18/07, 2:00 PM
Mr
Kentaro Kojima
(Kyusyu University)
12/18/07, 2:50 PM
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.
Prof.
Yutaka Hosotani
(Osaka University)
12/18/07, 3:40 PM
Dr
Nobuhito Maru
(Kobe University)
12/18/07, 4:30 PM
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...
Prof.
Yoshiharu Kawamura
(Shinshu University)
12/18/07, 4:50 PM
Mr
Takaaki Nomura
(Saitama University)
12/18/07, 5:40 PM
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...
Prof.
Biswajoy Brahmachari
(Vidyasagae Evening College)
12/18/07, 6:00 PM
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...
Prof.
Hitoshi Murayama
(University of California, Berkeley and Institute for the Physics and Mathematics of the Universe, University of Tokyo)
12/19/07, 9:00 AM
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.
Dr
Toshifumi Yamashita
(Osaka University)
12/19/07, 9:50 AM
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.
Dr
Masafumi Kurachi
(YITP, Kyoto University)
12/19/07, 10:10 AM
Prof.
Masahiro Kawasaki
(ICRR, University of Tokyo)
12/19/07, 11:00 AM
Prof.
Qaisar Shafi
(Bartol Research Institute and Delaware University)
12/19/07, 11:50 AM
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...
