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

Gurtu, A. (2011) A search for excited leptons in pp collisions at √s = 7 TeV Physics Letters B, 704 (3). pp. 143-162. ISSN 0370-2693

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.physletb.2011.09.021


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 √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·lγ , resulting in the llγ final state, where l = e, μ. No excess of events above the standard model expectation is observed. Interpreting the findings in the context of l· production through four-fermion contact interactions and subsequent decay via electroweak processes, first upper limits are reported for Λ production at this collision energy. The exclusion region in the compositeness scale Λ and excited lepton mass Ml· parameter space is extended beyond previously established limits. For Λ = Ml·, excited lepton masses are excluded below 1070 GeV/c2 for e· and 1090 GeV/c2 for μ· at the 95% confidence level.

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