# A light CP-odd Higgs boson of the MSSM Higgs sector extended by dimension-six operators

## TL;DR

This paper explores the potential of a light CP-odd Higgs boson in the MSSM extended by dimension-six operators to explain an observed muon excess at 28 GeV, analyzing its theoretical consistency and LHC phenomenology.

## Contribution

It introduces a scenario within the MSSM extended by dimension-six operators that accounts for a light CP-odd Higgs boson explaining experimental muon excesses.

## Key findings

- Identifies MSSM parameter space consistent with the muon excess
- Discusses unitarity and vacuum stability constraints
- Analyzes LHC phenomenology including top-quark decay

## Abstract

The possibility of identification of an observable CMS $\mu^+ \mu^-$ excess at 28 GeV in the channel $pp\to \mu^+ \mu^- b \bar b$ at $\sqrt{s}$=8 TeV and 13 TeV as a manifestation of one of the minimal supersymmetric standard model (MSSM) Higgs bosons is investigated. The MSSM parametric scenarios in the regime of large threshold corrections involving low-mass CP-odd scalar, a 125 GeV CP-even scalar and other Higgs bosons with suitable masses are found, where the alignment limit conditions for the Higgs couplings are respected. Perturbative unitarity bounds and constraints on the electroweak vacuum stability are discussed in the regime of substantial couplings with the top- and bottom superpartners. LHC phenomenology including top-quark decay in such a regime is analyzed.