All Fermion Masses and Mixings in an Intersecting D-brane World

Abstract

It is shown that neutrino mixing angles which are consistent with current experimental observations may be naturally obtained in a Pati-Salam model constructed from intersecting D6 branes on a \(T^6/(\Z_2 \times \Z_2)\) orientifold. The Dirac mass matrices in the model are shown to be of the exact same form as those which lead directly to near near-tribimaximal mixing, as shown by Ma. In addition, it is possible to obtain the correct mass matrices for quarks and charged leptons, as well as nearly the correct CKM matrix. Assuming nearly degenerate right-handed neutrino masses, we obtain Majorana neutrino masses which are consistent with experimental observations of the mass-squared differences between neutrinos, as well as a PMNS matrix which is consistent with observations.