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Properties of fermion mixings in intersecting D-brane models. (English) Zbl 1247.81367
Summary: 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 \(\simeq 0.05\)-\(0.15\). In the quark sector, Vcb is naturally close to the strange/bottom quark mass ratio and we obtain an approximate relation VubVcb\(\simeq ^{2}\)(ms/mb)Vus. The geometrical interpretations of the neutrino mixings are also discussed.

MSC:
81T30 String and superstring theories; other extended objects (e.g., branes) in quantum field theory
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