Study of MSSM heavy Higgs bosons decaying into charginos and neutralinos

TL;DR

This paper investigates the decay of MSSM heavy Higgs bosons into charginos and neutralinos, estimating their maximum branching ratios and analyzing potential collider signatures at the LHC within current experimental constraints.

Contribution

It provides a detailed analysis of heavy Higgs decays into electroweakinos, including parameter scans, collider simulations, and discovery prospects at the LHC, which was not extensively explored before.

Findings

Maximum branching ratios for heavy Higgs to electroweakinos are identified.

Potential collider signatures like mono-X + MET and trilepton + MET are analyzed.

Discovery reach at the high-luminosity LHC is estimated for these decay modes.

Abstract

A multitude of searches have already been performed by the ATLAS and CMS collaborations at the LHC to probe the heavy Higgses of the Minimal Supersymmetric Standard Model (MSSM) through their decay to the Standard Model particles. In this paper, we study the decay of the MSSM heavy Higgses into neutralino and chargino pairs and estimate the maximum possible branching ratios for these `ino' modes being consistent with the present LHC data. After performing a random scan of the relevant electroweakino parameters, we impose the SM 125 GeV Higgs constraints, low energy flavour data as well as current bounds on heavy Higgses from the LHC run-I and run-II data. The present limits on the electroweakino masses and couplings are also considered in our analysis. We choose a few representative benchmark points satisfying all the above-mentioned constraints, and then perform a detailed collider simulation, including fast detector effects, and analyze all the potential SM backgrounds in order to estimate the discovery reach of these heavy Higgses at the LHC. We restrict ourselves within the leptonic cascade decay modes of these heavy Higgses and study the mono-X + MET (X=W,Z) and trilepton + MET signatures in the context of high luminosity run of the 14 TeV LHC.