Low Scale Non-universal, Non-anomalous U(1)'_F in a Minimal Supersymmetric Standard Model

TL;DR

This paper introduces a low-scale, non-universal U(1)'_F symmetry within a minimal supersymmetric framework, successfully addressing anomaly cancellation, fermion mass hierarchies, and suppression of unwanted operators, while satisfying flavor constraints.

Contribution

It presents a novel non-universal U(1)'_F model with realistic fermion masses, mixing, and anomaly cancellation without exotic fields, predicting Dirac neutrinos with inverted hierarchy.

Findings

Anomaly cancellation achieved without exotic fields.

Realistic fermion masses and mixing angles obtained.

D0-D0bar mixing constraints are most stringent.

Abstract

We propose a non-universal U(1)'_F symmetry combined with the Minimal Supersymmetric Standard Model. All anomaly cancellation conditions are satisfied without exotic fields other than three right-handed neutrinos. Because our model allows all three generations of chiral superfields to have different U(1)'_F charges, upon the breaking of the U(1)'_F symmetry at a low scale, realistic masses and mixing angles in both the quark and lepton sectors are obtained. In our model, neutrinos are predicted to be Dirac fermions and their mass ordering is of the inverted hierarchy type. The U(1)'_F charges of the chiral super-fields also naturally suppress the mu term and automatically forbid baryon number and lepton number violating operators. While all flavor-changing neutral current constraints in the down quark and charged lepton sectors can be satisfied, we find that constraint from D0-D0bar turns out to be much more stringent than the constraints from the precision electroweak data.