Properties of fermion mixings in intersecting D-brane models
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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, V cb is naturally close to the strange/bottom quark mass ratio and we obtain an approximate relation VubVcb≃(m s/mb)2Vus. The geometrical interpretations of the neutrino mixings are also discussed. © 2006 Elsevier B.V. All rights reserved.
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Dutta, Bhaskar||Mimura, Yukihiro