4 papers
Neutrino Masses and Mixing from Bilinear R-Parity Violation
Fumihiro Takayama, Masahiro Yamaguchi
Neutrino masses and mixing are generated in a supersymmetric standard model when R-parity is violated in bilinear mass terms. The mixing matrix among the neutrinos takes a restrict…
Fate of Gravitons in Warped Extra Dimension
Sanghyeon Chang, Masahiro Yamaguchi
Interaction of bulk gravitons to Standard Model particles is examined in the scenario of warped extra dimension. It is found that the length of the extra dimension is of physical i…
Axion in large extra dimension
Sanghyeon Chang, Shiro Tazawa, Masahiro Yamaguchi
We examine the axion model in the large extra dimensions scenario with TeV scale gravity. To obtain an intermediate-scale decay constant of the axion, the axion is assumed to live…
Stability of Gauge Hierarchy in Einstein Supergravity
Izumi Joichi, Yoshiharu Kawamura, Masahiro Yamaguchi
In supersymmetric grand unified theories, the gauge hierarchy achieved by a fine-tuning in the superpotential can be violated in the presence of soft breaking terms. We examine thi…