Doubly-charged Higgs and vacuum stability in left-right supersymmetry

TL;DR

This paper analyzes supersymmetric left-right models with Higgs in the adjoint representation, providing a detailed one-loop mass calculation for the doubly-charged Higgs and examining experimental and vacuum stability constraints.

Contribution

It offers the first complete one-loop mass calculation for the doubly-charged Higgs in these models and assesses how experimental bounds are affected by additional Higgs states.

Findings

Loop corrections can shift the doubly-charged Higgs mass by hundreds of GeV.

Existing LHC bounds are significantly modified by the presence of singly-charged Higgs bosons.

Vacuum stability constraints could exclude these models at future LHC runs.

Abstract

We present an analysis of supersymmetric left-right symmetric models with Higgs fields lying in the adjoint representation of $SU(2)_R$. These models feature a doubly-charged Higgs boson which gets its mass only at the loop level. We present, for the first time, a complete one-loop calculation of this mass and show that contributions that have been neglected so far can shift it by a few hundreds of GeV. We then combine this observation with LHC bounds deduced from extra charged gauge boson and doubly-charged Higgs boson searches. In particular, we point out that existing limits get substantially modified by the presence of singly-charged Higgs bosons that are also predicted in these models. In addition, we address constraints stemming from vacuum stability considerations and show how the considered class of models could be ruled out at the next LHC run in the absence of any signal.