Khachatryan, V. and Bornheim, A. and Bunn, J. and Chen, Y. and Dubinin, M. and Gataullin, M. and Kcira, D. and Litvine, V. and Ma, Y. and Mott, A. and Newman, H. B. and Rogan, C. and Spiropulu, M. and Timciuc, V. and Traczyk, P. and Veverka, J. and Wilkinson, R. and Yang, Y. and Zhu, R. Y. (2011) Search for Pair Production of First-Generation Scalar Leptoquarks in pp Collisions at √s = 7 TeV. Physical Review Letters, 106 (20). Art. No. 201802. ISSN 0031-9007 http://resolver.caltech.edu/CaltechAUTHORS:20110614-091608218
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A search for pair production of first-generation scalar leptoquarks is performed in the final state containing two electrons and two jets using proton-proton collision data at √s=7 TeV. The data sample used corresponds to an integrated luminosity of 33 pb^(-1) collected with the CMS detector at the CERN LHC. The number of observed events is in good agreement with the predictions for the standard model background processes, and an upper limit is set on the leptoquark pair production cross section times β^2 as a function of the leptoquark mass, where β is the branching fraction of the leptoquark decay to an electron and a quark. A 95% confidence level lower limit is set on the mass of a first-generation scalar leptoquark at 384 GeV for β=1, which is the most stringent direct limit to date.
|Additional Information:||© 2011 CERN, for the CMS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Received 17 December 2010; published 17 May 2011. We wish to thank Michael Krämer for providing the NLO LQ pair production cross sections at √s = 7 TeV. We 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); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); NRF and WCU (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); MSTD (Serbia); MICINN and CPAN (Spain); Swiss Funding Agencies (Switzerland); NSC (Taipei); TUBITAK and TAEK (Turkey); STFC (United Kingdom); DOE and NSF (USA).|
|Classification Code:||PACS: 14.80.Sv, 12.60.-i, 13.85.Rm|
|Official Citation:||Search for Pair Production of First-Generation Scalar Leptoquarks in pp Collisions at √s=7 TeV V. Khachatryan et al. (CMS Collaboration) Published 17 May 2011 (15 pages) 201802|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||14 Jun 2011 18:36|
|Last Modified:||25 Feb 2013 23:15|
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