Search for Dark Matter and Large Extra Dimensions in the photon + met final state

We present a search for new physics that results in a final state consisting of a high pt photon and high missing transverse energy, which can arise from models involving dark matter production, ADD or Branon large extra dimensions in pp collisions at 8 TeV. We find no deviation from the Standard Model prediction for this final state and achieve an extension of the current limits on parameter space. This study is done with the data taken by the CMS experiment at the LHC in 2012, corresponding to an integrated luminosity of 19.6 fb-1 of data.