Search for new physics in events with opposite-sign leptons, jets, and missing transverse energy in pp collisions at √s = 7 TeV

摘要

A search is presented for physics beyond the standard model (BSM) in final states with a pair of opposite signudisolated leptons accompanied by jets and missing transverse energy. The search uses LHC data recorded at a center-of-mass energy √s = 7 TeV with the CMS detector, corresponding to an integrated luminosity of approximately 5 fb^(−1). Two complementary search strategies are employed. The first probes models with a specific dilepton production mechanism that leads to a characteristic kinematic edge in the dilepton mass distribution. The second strategy probes models of dilepton production with heavy, colored objects that decay to final states including invisible particles, leading to very large hadronic activity and missing transverse energy. No evidence for an event yield in excess of the standard model expectationsudis found. Upper limits on the BSM contributions to the signal regions are deduced from the results, which are used to exclude a region of the parameter space of the constrained minimal supersymmetric extension of the standard model. Additional information related to detector efficiencies and response is provided to allow testing specific models of BSM physics not considered in this Letter.