  We present a search for large extra dimensions and dark matter
pair-production using events with a photon and missing transverse energy in pp
collisions at $\sqrt{s} =8$ TeV. This search is done with the data taken by the
CMS experiment at the LHC corresponding to an integrated luminosity of 19.6
fb$^{-1}$. We find no deviations with respect to the standard model expectation
and improve the current limits on several models.
