$R$ parity violation from discrete $R$ symmetries

TL;DR

This paper explores supersymmetric models with discrete $R$ symmetries replacing $R$ or matter parity, identifying symmetries that ensure nucleon stability and address the $$ problem, while analyzing their compatibility with gauge unification.

Contribution

It introduces a novel method to derive maximal $ Z_N^{(R)}$ symmetries satisfying specific constraints and classifies RPV and R-conserving models consistent with unification.

Findings

Identified symmetries compatible with gauge unification.

Developed a method to derive maximal $ Z_N^{(R)}$ symmetries.

Counter-example to previous claims about $$ and bilinear operators.

Abstract

We consider supersymmetric extensions of the standard model in which the usual $R$ or matter parity gets replaced by another $R$ or non-$R$ discrete symmetry that explains the observed longevity of the nucleon and solves the $\mu$ problem of MSSM. In order to identify suitable symmetries, we develop a novel method of deriving the maximal $\mathbb{Z}_{N}^{(R)}$ symmetry that satisfies a given set of constraints. We identify $R$ parity violating (RPV) and conserving models that are consistent with precision gauge unification and also comment on their compatibility with a unified gauge symmetry such as the Pati-Salam group. Finally, we provide a counter-example to the statement found in the recent literature that the lepton number violating RPV scenarios must have $\mu$ term and the bilinear $\kappa \, L \, H_u$ operator of comparable magnitude.