Probing the $\mu\nu$SSM with light scalars, pseudoscalars and neutralinos from the decay of a SM-like Higgs boson at the LHC

TL;DR

This paper investigates how the $mbda$SSM model predicts unique signatures at the LHC from Higgs decays into light scalars, pseudoscalars, and neutralinos, which could explain observed phenomena and guide future searches.

Contribution

It provides a detailed analysis of potential LHC signatures from Higgs decays into new light states in the $mbda$SSM, highlighting novel decay channels and displaced vertices.

Findings

Light neutralinos can produce displaced multi-leptons, taus, jets, or photons.

Higgs decays into scalars/pseudoscalars yield prompt multi-leptons, taus, jets, or photons.

Characteristic signatures depend on the mass spectrum and decay lengths.

Abstract

The "$\mu$ from $\nu$" supersymmetric standard model ($\mu\nu$SSM) can accommodate the newly discovered Higgs-like scalar boson with a mass around 125 GeV. This model provides a solution to the $\mu$-problem and simultaneously reproduces correct neutrino physics by the simple use of right-handed neutrino superfields. These new superfields together with the introduced $R$-parity violation can produce novel and characteristic signatures of the $\mu\nu$SSM at the LHC. We explore the signatures produced through two-body Higgs decays into the new states, provided that these states lie below in the mass spectrum. For example, a pair produced light neutralinos depending on the associated decay length can give rise to displaced multi-leptons/taus/jets/photons with small/moderate missing transverse energy. In the same spirit, a Higgs-like scalar decaying to a pair of scalars/pseudoscalars can produce final states with prompt multi-leptons/taus/jets/photons.