Froggatt-Nielsen models with a residual Z_4^R symmetry

TL;DR

This paper constructs supersymmetric Froggatt-Nielsen models with a residual Z_4^R symmetry, explaining fermion mass hierarchies and neutrino masses while addressing anomaly cancellation and charge assignments.

Contribution

It presents explicit gauged U(1)_R Froggatt-Nielsen models with a residual Z_4^R symmetry, including detailed charge assignments and neutrino mass generation mechanisms.

Findings

Identified 102 viable charge assignments satisfying anomaly conditions.

Demonstrated mu-term generation from supersymmetry breaking scale.

Provided models with highly fractional charges for standard model fields.

Abstract

The Froggatt-Nielsen mechanism provides an elegant explanation for the hierarchies of fermion masses and mixings in terms of a U(1) symmetry. Promoting such a family symmetry to an R-symmetry, we explicitly construct supersymmetric Froggatt-Nielsen models which are gauged, family dependent U(1)_R completions of the Z_4^R symmetry proposed by Lee, Raby, Ratz, Ross, Schieren, Schmidt-Hoberg and Vaudrevange in 2010. Forbidden by Z_4^R, the mu-term is generated around the supersymmetry breaking scale m_3/2 from either the Kahler potential or the superpotential. Neutrinos acquire their mass via the type I seesaw mechanism with three right-handed neutrino superfields. Taking into account the Green-Schwarz anomaly cancellation conditions, we arrive at a total of 3 x 34 distinct phenomenologically viable charge assignments for the standard model fields, most of which feature highly fractional charges.