A Measurement of Neutralino Mass at the LHC in Light Gravitino Scenarios

TL;DR

This paper proposes a method to directly measure the neutralino mass at the LHC in light gravitino scenarios using two photons plus missing energy events, independent of other SUSY parameters.

Contribution

The paper introduces a novel application of the MT2 method for direct neutralino mass measurement in light gravitino SUSY models at the LHC.

Findings

Successful application of MT2 method to simulated LHC events

Neutralino mass can be measured independently of cascade decay patterns

Method applicable to light gravitino SUSY scenarios

Abstract

We consider supersymmetric (SUSY) models in which a very light gravitino is the lightest SUSY particle. Assuming that a neutralino is the next-to-lightest SUSY particle, we present a measurement of the neutralino mass at the LHC in two photons + missing energy events, which is based on the MT2 method. It is a direct measurement of the neutralino mass itself, independent of other SUSY particle masses and patterns of cascade decays before the neutralino is produced.