  A search for diphoton events with large missing transverse momentum has been
performed using proton-proton collision data at sqrt(s) = 7 TeV recorded with
the ATLAS detector, corresponding to an integrated luminosity of 4.8 fb^-1. No
excess of events was observed above the Standard Model prediction and
model-dependent 95% confidence level exclusion limits are set. In the context
of a generalised model of gauge-mediated supersymmetry breaking with a
bino-like lightest neutralino of mass above 50 GeV, gluinos (squarks) below
1.07 TeV (0.87 TeV) are excluded, while a breaking scale Lambda below 196 TeV
is excluded for a minimal model of gauge-mediated supersymmetry breaking. For a
specific model with one universal extra dimension, compactification scales 1/R
< 1.40 TeV are excluded. These limits provide the most stringent tests of these
models to date.
