“School of Particles”
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| Paper IPM / Particles / 12062 |
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A search for excited leptons is carried out with the CMS detector at the LHC, using 36 pb-1 of pp collision data recorded at sqrt(s) = 7 TeV. The search is performed for associated production of a lepton and an oppositely charged excited lepton pp ! ll followed by the decay l ! lg, resulting in the llg final state, where l = e, m. No
excess of events above the standard model expectation is observed. Interpreting the findings in the context of lproduction through four-fermion contact interactions and
subsequent decay via electroweak processes, first upper limits are reported for l*production at this collision energy. The exclusion region in the compositeness scale L and excited lepton mass Mlparameter space is extended beyond previously established limits. For L = Ml , excited lepton masses are excluded below 1070 GeV/c 2 for e and 1090 GeV/c 2 for m* at the 95
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