Search for dark matter and large extra dimensions in PP collisions yielding a photon and missing transverse energy

Abstract

Results are presented from a search for new physics in the final state containing a photon and missing transverse energy. The data corresponds to an integrated luminosity of 5.0 fb collected in pp collisions at √s= 7 TeV by the CMS experiment. The observed event yield agrees with standard model expectations. Using models for the production of dark matter particles(χ), we set 90% confidence level (C.L.) upper limits of 13.6-15.4 fb on production in the γ+ ÆT state. These provide the most sensitive upper limits for spin-dependent χ-nucleon scattering for masses between 1 and 100 GeV. For spin dependent contributions, the present limits are extended to M(χ) < 3.5 GeV. For ADD models with 3-6 large extra dimensions, our data exclude extra-dimensional Planck scales between 1.64 and 1.73 TeV at 95% C.L. © Institute of Experimental Physics SAS, Košice, Slovakia.