@article{10902/26834,
year = {2011},
url = {https://hdl.handle.net/10902/26834},
abstract = {A search for excited leptons is carried out with the CMS detector at the LHC, using 36pb−1 of pp collision data recorded at s=7TeV. 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 ⁎Mℓ⁎ parameter space is extended beyond previously established limits. For ⁎Λ=Mℓ⁎, excited lepton masses are excluded below 1070GeV/c2 for ⁎e⁎ and 1090GeV/c2 for ⁎μ⁎ at the 95% confidence level.},
organization = {We wish to congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC machine. We thank the technical and administrative staff at CERN and other CMS institutes, and acknowledge support from: FMSR (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES (Croatia); RPF (Cyprus); Academy of Sciences and NICPB (Estonia); Academy of Finland, ME, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NKTH (Hungary); CSIR, DAE, and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); NRF (Korea); LAS (Lithuania); CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico); PAEC (Pakistan); SCSR (Poland); FCT (Portugal); JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan); MST and MAE (Russia); MSTDS (Serbia); MICINN and CPAN (Spain); Swiss Funding Agencies (Switzerland); NSC (Taipei); TUBITAK and TAEK (Turkey); STFC (United Kingdom); DOE and NSF (USA).},
publisher = {Elsevier},
publisher = {Physics Letters, Section B, 2011, 704, 143-162},
title = {A search for excited leptons in pp collisions at √s = 7 TeV},
author = {Chatrchyan, S. and Brochero Cifuentes, Javier Andrés and Cabrillo Bartolomé, José Iban and Calderón Tazón, Alicia and Chuang, S. H. and Duarte Campderros, Jorge and Felcini, Marta and Fernández García, Marcos and Gómez Gramuglio, Gervasio and González Sánchez, Francisco Javier and Jordá Lope, Clara and Lobelle Pardo, Patricia and López Virto, María Amparo and Marco de Lucas, Jesús and Marco de Lucas, Rafael José and Martínez Rivero, Celso and Matorras Weinig, Francisco and Muñoz Sánchez, Francisca Javiela and Piedra Gómez, Jonatan and Rodrigo Anoro, Teresa and Rodríguez Marrero, Ana Yaiza and Ruiz Jimeno, Alberto and Scodellaro, Luca and Sobrón Sañudo, Mar and Vila Álvarez, Iván  and Vilar Cortabitarte, Rocío},
}