Search for excited leptons in pp collisions at $\sqrt{s}= 7$ TeV

Abstract

A search for excited leptons, carried out with the CMS detector in pp collision at the LHC with $\sqrt{s} = 7$ TeV, is presented. The search has been performed for an associated production of a lepton and an oppositely charged excited lepton pp →ll ^*, followed by the decay l ^*→lγ, resulting in llγ final state, where l = e,μ. No excess above the Standard Model expectation is observed in the data. Interpreting the findings in the context of l ^* production through four-fermion contact interactions and l ^* decay via electroweak processes, upper limits are reported for l ^* production at this collision energy and the exclusion region in the Λ − M(l ^*) parameter space is extended beyond the previously established limits.