Search for excited leptons in pp collisions at √s = 7 TeV

A search for excited leptons, carried out with the CMS detector in pp collision at the LHC with √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. (author)