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Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/45799
Title: A search for excited leptons in pp Collisions at sqrt(s) = 7 TeV
Authors: Brochero Cifuentes, J. A.; Cabrillo, I. J. ; Calderón-Urrea, Alejandro; Chuang, S. H.; Duarte Campderros, J.; Felcini, M.; Fernández, M.; Gómez, G.; González Sánchez, J.; Jorda, C.; Lobelle Pardo, P.; López Virto, A.; Marco, Jesús; Marco, Rafael; Martínez-Rivero, Celso; Matorras, Francisco; Muñoz Sánchez, F. J.; Piedra, Jonatan; Rodrigo, Teresa; Rodriguez Marrero, Ana Y.; Ruiz Jimeno, Alberto; Scodellaro, Luca; Sobron Sañudo, M.; Vila, Iván; Vilar, Rocío
Keywords: CMS
Issue Date: Oct-2011
Publisher: Elsevier
Citation: Physics Letters B 704(3): 143-162 (2011)
Abstract: A search for excited leptons is carried out with the CMS detector at the LHC, using 36 inverse picobarns 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 to l l*, followed by the decay l* to l gamma, resulting in the l l gamma final state, where l = electron or muon. 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 Lambda and excited lepton mass M(l*) parameter space is extended beyond previously established limits. For Lambda = M(l*), excited lepton masses are excluded below 1070 GeV/c^2 for e* and 1090 GeV/c^2 for mu* at the 95% confidence level.
Description: 20 páginas, 2 figuras, 2 tablas.-- This article is published Open Access at sciencedirect.com. It is distributed under the terms of the Creative Commons Attribution License 3.0.-- CMS Collaboration: et al.
Publisher version (URL): http://dx.doi.org/10.1016/j.physletb.2011.09.021
URI: http://hdl.handle.net/10261/45799
DOI: 10.1016/j.physletb.2011.09.021
ISSN: 0370-2693
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