On Fermion Mass Hirerachies in MSSM-like Quiver Models with Stringy Corrections

TL;DR

This paper explores how instanton effects in a string-inspired MSSM-like model can generate fermion mass hierarchies, providing a partial solution consistent with neutrino mass data.

Contribution

It demonstrates that superpotential coupling scales in a four-stack D-brane quiver model can explain fermion mass hierarchies using stringy instanton effects.

Findings

Superpotential coupling scales vary across generations.

The model's predictions align with observed neutrino masses.

Partial fermion mass hierarchy is achieved through stringy effects.

Abstract

Using instanton effects, we discuss the problem of fermion mass hierarchies in an MSSM-like Type IIA orientifolded model with U(3)xSp(1)xU(1)xU(1) gauge symmetry obtained from intersecting D6-branes. In the corresponding four-stack quiver, the different scales of the generated superpotential couplings offer a partial solution to fermion mass hierarchies. Using the known data with neutrino masses m_{v_{\tau}}\lesssim 2 eV, we give the magnitudes of the relevant scales.