Properties of Fermion Mixings in Intersecting D-brane Models
Dutta, Bhaskar · Mimura, Yukihiro
Original · EN
We consider the Yukawa couplings for quarks and leptons in the context of Pati-Salam model using intersecting D-brane models where the Yukawa coupling matrices are rank one in a simple choice of family replication. The CKM mixings can be explained by perturbing the rank 1 matrix using higher order terms involving new Higgs fields available in the model. We show that the near bi-large neutrino mixing angles can be naturally explained, choosing the light neutrino mass matrix to be type II seesaw dominant. The predicted value of Uₑ₃ is in the range ≃ 0.05-0.15. In the quark sector, Vcb is naturally close to the strange/bottom quark mass ratio and we obtain an approximate relation Vub Vcb ≃ (mₛ/mb)² Vus. The geometrical interpretations of the neutrino mixings are also discussed.
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