LHC reach for gauge mediated supersymmetry breaking models via prompt photon channels

We evaluate the supersymmetry reach of the Large Hadron Collider within the gauge-mediated low energy supersymmetry breaking framework, assuming that a neutralino is the second lightest sparticle and that it decays promptly into a gravitino which escapes detection. We find that the maximum reach is obtained via a search for inclusive γγ+E/T events coming dominantly from chargino and neutralino production. Assuming an integrated luminosity of 10 fb−1, we find that LHC experiments will be able to probe values of the model parameter Λ≲400 TeV, corresponding to mg̃≤2.8 TeV. A measure of the model parameter Λ may be possible from the photon pT spectrum.