Speaker
Yoshiyuki Tatsuta
(Waseda Univ.)
Description
We study the effects of D-brane instantons wrapping rigid cycles on the $Z_2 \times Z_2$ toroidal orbifold. We compute Majorana masses induced by rigid D-brane instantons and realize bimaximal mixing matrices in certain models. We can also derive more generic mass matrices in other models. The bimaximal mixing Majorana mass matrix provides a possibility for explaining observed mixing angles. We also compute the $\mu$-term matrix among more than one pair of Higgs fields induced by rigid D-brane instantons.
Author
Yoshiyuki Tatsuta
(Waseda Univ.)
Co-authors
Shohei Uemura
(Kyoto Univ.)
Tatsuo Kobayashi
(Hokkaido Univ.)
