Abstract: A search for excited leptons is carried out with the CMS detector at the LHC, using 36pb?1 of pp collision data recorded at s=7TeV. The search is performed for associated production of a lepton and an oppositely charged excited lepton ?pp????, followed by the decay ??????, resulting in the ??? final state, where ?=e,?. No excess of events above the standard model expectation is observed. Interpreting the findings in the context of ??? production through four-fermion contact interactions and subsequent decay via electroweak processes, first upper limits are reported for ??? production at this collision energy. The exclusion region in the compositeness scale ? and excited lepton mass ?M?? parameter space is extended beyond previously established limits. For ??=M??, excited lepton masses are excluded below 1070GeV/c2 for ?e? and 1090GeV/c2 for ??? at the 95% confidence level.

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