Fermion Masses and Mixings in String Theory with Dirac Neutrinos

We examine the most realistic class of models among the 33 candidates in the complete landscape of supersymmetric Pati-Salam models arising from intersecting D6-branes on a T⁶/(Z₂ × Z₂) orientifold in type IIA string theory. The class is characterized by twelve Higgs from the N=2 sector that precisely account for the Standard Model fermion masses and mixings without Wilson fluxes. Notably, there is a natural prediction of Dirac neutrino-masses with normal ordering $(50.4,~10.5,~6.1)$~meV consistent with both experimental constraints and swampland bounds.