Search for Diphoton Events with Large Missing Transverse Momentum in 1 fb^-1 of 7 TeV Proton-Proton Collision Data with the ATLAS Detector

A search for diphoton events with large missing transverse momentum has been performed using of proton–proton collision data at recorded with the ATLAS detector. No excess of events was observed above the Standard Model prediction and 95% Confidence Level (CL) upper limits are set on the production cross section for new physics. The limits depend on each model parameter space and vary as follows: in the context of a generalised model of gauge-mediated supersymmetry breaking (GGM) with a bino-like lightest neutralino, in the context of a minimal model of gauge-mediated supersymmetry breaking (SPS8), and in the context of a specific model with one universal extra dimension (UED). A 95% CL lower limit of , for bino masses above 50 GeV, is set on the GGM gluino mass. Lower limits of and are set on the SPS8 breaking scale Λ and on the UED compactification scale , respectively. These limits provide the most stringent tests of these models to date.