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

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