A search for excited leptons in pp collisions at √s = 7 TeV
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Chatrchyan-2011-A search for excited.pdf
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Author(s)
Bendavid, Joshua L.
Busza, Wit
Butz, Erik M.
Cali, Ivan Amos
Chan, M.
Everaerts, Pieter Bruno Bart
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Hahn, Kristian Allan
Kim, Y.
Date Issued
September 2011
Journal
Physics Letters B
Publisher
Elsevier
Citation
Chatrchyan, S., V. Khachatryan, A.M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, et al. “A Search for Excited Leptons in Pp Collisions at √s = 7 TeV.” Physics Letters B 704, no. 3 (October 2011): 143–162. © 2011 CERN
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. School of Science
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DOI of Published Version
https://doi.org/10.1016/j.physletb.2011.09.021
