Chiral Extensions of the MSSM

TL;DR

This paper introduces chiral extensions of the MSSM with an extra U'(1) gauge symmetry, featuring a fully chiral field content, no mu-terms, and no baryon or lepton number violation, analyzing its mass spectrum and flavor constraints.

Contribution

It proposes a novel MSSM extension with family-dependent charges, multiple Higgs doublets, and singlets, avoiding mu-terms and baryon/lepton violation, and studies its phenomenological implications.

Findings

The model's tree-level mass spectrum is characterized.

Constraints on flavor changing processes are analyzed.

The model maintains anomaly cancellation with additional singlets.

Abstract

We present a class of extensions of the MSSM characterized by a fully chiral field content (no mu-terms) and no baryon or lepton number violating term in the superpotential due to an extra U'(1) gauge symmetry. The minimal model consist of the usual matter sector with family dependent U'(1) charges, six Higgs weak doublets, and three singlets required to give masses to the Higgsinos and cancel anomalies. We discuss its main features such as the tree level mass spectrum and the constraints on flavor changing processes.