Journal Article Majorana neutrino mass structure induced by rigid instantons on toroidal orbifold

Kobayashi, Tatsuo  ,  Tatsuta, Yoshiyuki  ,  Uemura, Shohei

93 ( 6 )  , p.065029 , 2016-03-16 , American Physical Society (APS)
We study the effects of D-brane instantons wrapping rigid cycles on the Z(2) x 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.

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