@article{3073298,
    title = "Search for excited leptons in pp collisions at s=7 TeV",
    author = "Chatrchyan, S. and Khachatryan, V. and Sirunyan, A.M. and Tumasyan, A. and Adam, W. and Aguilo, E. and Bergauer, T. and Dragicevic, M. and Erö, J. and Fabjan, C. and Friedl, M. and Frühwirth, R. and Ghete, V.M. and Hammer, J. and Hörmann, N. and Hrubec, J. and Jeitler, M. and Kiesenhofer, W. and Knünz, V. and Krammer, M. and Krätschmer, I. and Liko, D. and Mikulec, I. and Pernicka, M. and Rahbaran, B. and Rohringer, C. and Rohringer, H. and Schöfbeck, R. and Strauss, J. and Taurok, A. and Waltenberger, W. and Walzel, G. and Widl, E. and Wulz, C.-E. and Mossolov, V. and Shumeiko, N. and Suarez Gonzalez, J. and Bansal, M. and Bansal, S. and Cornelis, T. and De Wolf, E.A. and Janssen, X. and Luyckx, S. and Mucibello, L. and Ochesanu, S. and Roland, B. and Rougny, R. and Selvaggi, M. and Staykova, Z. and Van Haevermaet, H. and Van Mechelen, P. and Van Remortel, N. and Van Spilbeeck, A. and Blekman, F. and Blyweert, S. and DʼHondt, J. and Gonzalez Suarez, R. and Kalogeropoulos, A. and Maes, M. and Olbrechts, A. and Van Doninck, W. and Van Mulders, P. and Van Onsem, G.P. and Villella, I. and Clerbaux, B. and De Lentdecker, G. and Dero, V. and Gay, A.P.R. and Hreus, T. and Léonard, A. and Marage, P.E. and Mohammadi, A. and Reis, T. and Thomas, L. and Vander Marcken, G. and Vander Velde, C. and Vanlaer, P. and Wang, J. and Adler, V. and Beernaert, K. and Cimmino, A. and Costantini, S. and Garcia, G. and Grunewald, M. and Klein, B. and Lellouch, J. and Marinov, A. and Mccartin, J. and Ocampo Rios, A.A. and Ryckbosch, D. and Strobbe, N. and Thyssen, F. and Tytgat, M. and Verwilligen, P. and Walsh, S. and Yazgan, E. and Zaganidis, N. and Basegmez, S. and Bruno, G. and Castello, R. and Ceard, L. and Delaere, C. and du Pree, T. and Favart, D. and Forthomme, L. and Giammanco, A. and Hollar, J. and Lemaitre, V. and Liao, J. and Militaru, O. and Nuttens, C. and Pagano, D. and Pin, A. and Piotrzkowski, K. and Schul, N. and Vizan Garcia, J.M. and Beliy, N. and Caebergs, T. and Daubie, E. and Hammad, G.H. and Alves, G.A. and Correa Martins Junior, M. and De Jesus Damiao, D. and Martins, T. and Pol, M.E. and Souza, M.H.G. and Aldá Júnior, W.L. and Carvalho, W. and Custódio, A. and Da Costa, E.M. and De Oliveira Martins, C. and Fonseca De Souza, S. and Matos Figueiredo, D. and Mundim, L. and Nogima, H. and Oguri, V. and Prado Da Silva, W.L. and Santoro, A. and Soares Jorge, L. and Sznajder, A. and Anjos, T.S. and Bernardes, C.A. and Dias, F.A. and Fernandez Perez Tomei, T.R. and Gregores, E.M. and Lagana, C. and Marinho, F. and Mercadante, P.G. and Novaes, S.F. and Padula, S.S. and Genchev, V. and Iaydjiev, P. and Piperov, S. and Rodozov, M. and Stoykova, S. and Sultanov, G. and Tcholakov, V. and Trayanov, R. and Vutova, M. and Dimitrov, A. and Hadjiiska, R. and Kozhuharov, V. and Litov, L. and Pavlov, B. and Petkov, P. and Bian, J.G. and Chen, G.M. and Chen, H.S. and Jiang, C.H. and Liang, D. and Liang, S. and Meng, X. and Tao, J. and 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    journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",
    year = "2013",
    volume = "720",
    number = "4-5",
    pages = "309-329",
    publisher = "Elsevier B.V.",
    doi = "10.1016/j.physletb.2013.02.031",
    abstract = "Results are presented of a search for compositeness in electrons and muons using a data sample of pp collisions at a center-of-mass energy s=7 TeV collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 5.0 fb−1. Excited leptons (ℓ⁎) are assumed to be produced via contact interactions in conjunction with a standard model lepton and to decay via ℓ⁎→ℓγ, yielding a final state with two energetic leptons and a photon. The number of events observed in data is consistent with that expected from the standard model. The 95% confidence upper limits for the cross section for the production and decay of excited electrons (muons), with masses ranging from 0.6 to 2 TeV, are 1.48 to 1.24 fb (1.31 to 1.11 fb). Excited leptons with masses below 1.9 TeV are excluded for the case where the contact interaction scale equals the excited lepton mass. The limits on the cross sections are the most stringent ones published to date. © 2013 CERN"
}