Phenomenology of the minimal supersymmetric $U(1)_{B-L}\times U(1)_R$ extension of the standard model

TL;DR

This paper explores a minimal supersymmetric extension of the standard model with additional gauge groups, highlighting its unique phenomenology, compatibility with grand unification, and potential observable signatures at the LHC.

Contribution

It introduces a novel supersymmetric model with $U(1)_{B-L} imes U(1)_R$ gauge symmetry, analyzing its unification, Higgs sector, dark matter candidates, and collider phenomenology.

Findings

Gauge couplings unify similarly to MSSM.

Predicts more light Higgs states, including a 125 GeV Higgs.

Allows right sneutrinos as the lightest supersymmetric particle.

Abstract

We discuss the minimal supersymmetric $U(1)_{B-L}\times U(1)_R$ extension of the standard model. Gauge couplings unify as in the MSSM, even if the scale of $U(1)_{B-L}\times U(1)_R$ breaking is as low as order TeV and the model can be embedded into an SO(10) grand unified theory. The phenomenology of the model differs in some important aspects from the MSSM, leading potentially to rich phenomenology at the LHC. It predicts more light Higgs states and the mostly left CP-even Higgs has a mass reaching easily 125 GeV, with no constraints on the SUSY spectrum. Right sneutrinos can be the lightest supersymmetric particle, changing all dark matter constraints on SUSY parameter space. The model has seven neutralinos and squark/gluino decay chains involve more complicated cascades than in the MSSM. We also discuss briefly low-energy and accelerator constraints on the model, where the most important limits come from recent $Z'$ searches at the LHC and upper limits on lepton flavour violation.