A search for excited leptons in pp collisions at √s = 7 TeV
Author(s)Alver, B.; Bauer, Gerry P.; Bendavid, Joshua L.; Busza, Wit; Butz, Erik M.; Cali, Ivan Amos; Chan, M.; Dutta, V.; Everaerts, Pieter Bruno Bart; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Hahn, Kristian Allan; Harris, P.; Kim, Y.; Klute, Markus; Lee, Y.-J.; Li, W.; Loizides, C.; Luckey, P. David, Jr.; Ma, Teng; Nahn, Steven; Paus, Christoph M. E.; Ralph, Duncan Kelley; Roland, Christof E.; Roland, Gunther M.; Rudolph, Matthew Scott; Stephans, George S. F.; Stockli, Fabian; Sumorok, Konstanty C.; Sung, Kevin Kai Hong; Wenger, Edward Allen; Wolf, R.; Xie, S.; Yang, M.; Yilmaz, Yetkin; Yoon, A. S.; Zanetti, Marco; Wyslouch, Boleslaw; ... Show more Show less
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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.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of Science
Physics Letters B
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
Final published version