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

[摘要] A search for excited leptons is carried out with the CMS detector at the LHC, using 36 pb[superscript −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 ℓ* production at this collision energy. The exclusion region in the compositeness scale Λ and excited lepton mass M[subscript ℓ*] parameter space is extended beyond previously established limits. For Λ=M[subscript ℓ*], excited lepton masses are excluded below 1070 [GeV over c[superscript 2]] for e* and 1090 [GeV over c[superscript 2]] for μ* at the 95% confidence level.

[发布机构] Elsevier