Search for New Physics with a Monojet and Missing Transverse Energy in pp Collisions at sqrt(s) = 7 TeV

A study of events with missing transverse energy and an energetic jet is performed using $\Pp\Pp$ collision data at a centre-of-mass energy of 7\TeV. The data were collected by the CMS detector at the LHC, and correspond to an integrated luminosity of 1.1\fbinv. An excess of these events over standard model contributions is a signature of new physics such as large extra dimensions. The number of observed events is in good agreement with the prediction of the standard model, and a significant extension of the current limits on parameters of new physics benchmark models is achieved. For ADD Extra Dimension model parameter $\delta=2$, we exclude leading-order production of extra dimensions with $M_D < 3.7 \TeVcc$ at 95\% CL.