Higgs decay with monophoton + MET signature from low scale supersymmetry breaking

TL;DR

This paper investigates a Higgs decay process involving gravitinos and neutralinos in low-scale supersymmetry breaking scenarios, proposing it as a potential discovery channel at the LHC with a detailed model and background analysis.

Contribution

It introduces a novel Higgs decay channel into gravitinos and neutralinos in low-scale SUSY, along with a simplified model and LHC detection prospects.

Findings

Potential Higgs decay signal with photon and missing energy at LHC

Explicit SUSY model producing a 125 GeV Higgs without large radiative corrections

Estimated standard model backgrounds and discovery prospects

Abstract

We study the decay of a standard model-like Higgs boson into a gravitino and a neutralino, which subsequently decays promptly into another gravitino and a photon. Such a decay can be important in scenarios where the supersymmetry breaking scale is of the order of a few TeV, and in the region of low transverse momenta of the photon, it may provide the dominant contribution to the final state with a photon and two gravitinos. We estimate the relevant standard model backgrounds and the prospects for discovering this Higgs decay through a photon and missing transverse energy signal at the LHC in terms of a simplified model. We also give an explicit model with manifest, but spontaneously broken, supersymmetry in which the usual MSSM soft terms are promoted to supersymmetric operators involving a dynamical goldstino supermultiplet. This model can give rise to a SM-like CP-even neutral Higgs particle with a mass of 125 GeV, without requiring substantial radiative corrections, and with couplings sufficiently large for a signal discovery through the above mentioned Higgs decay channel with the upcoming data from the LHC.