Constraints on invisible Higgs decay in MSSM in the light of diphoton rates from the LHC

TL;DR

This paper explores the MSSM parameter space to reconcile a 125 GeV Higgs with LHC diphoton rates, showing that an invisible Higgs decay into neutralinos up to 10% is compatible with current data.

Contribution

It provides a phenomenological analysis of the MSSM without specific supersymmetry breaking assumptions, highlighting the possibility of invisible Higgs decays consistent with LHC observations.

Findings

A large MSSM parameter space can produce a 125 GeV Higgs with SM-like diphoton rates.

Invisible Higgs decay into neutralinos can be up to 10% without conflicting with LHC data.

The lightest neutralino can be significantly lighter than the Higgs, enabling invisible decays.

Abstract

We examine the parameter space of the purely phenomenological minimal super- symmetric standard model (MSSM), without assuming any supersymmetry breaking scheme. We find that a large region of the parameter space can indeed yield the lightest neutral Higgs mass around 125 GeV, as suggested by the recent ATLAS data, and also lead to event rates around, or slightly higher than, the standard model expectation in the two-photon and four-lepton channels. Using a lightest neutralino that is considerably lighter than the Higgs, we find that the 'invisible' decay of the Higgs into a pair of neutralinos upto about 10% can be consistent with the current data from the Large Hadron Collider (LHC).