Search for supersymmetry in pp collisions at 7 TeV in events with jets and missing transverse energy

Abstract

A search for supersymmetry with R-parity conservation in proton–proton collisions at a centre-of-mass energy of 7 TeV is presented. The data correspond to an integrated luminosity of 35 pb -1 collected by the CMS experiment at the LHC. The search is performed in events with jets and significant missing transverse energy, characteristic of the decays of heavy, pair-produced squarks and gluinos. The primary background, from standard model multijet production, is reduced by several orders of magnitude to a negligible level by the application of a set of robust kinematic requirements. With this selection, the data are consistent with the standard model backgrounds, namely tt¯, W + jet and Z + jet production, which are estimated from data control samples. Limits are set on the parameters of the constrained minimal supersymmetric extension of the standard model. These limits extend those set previously by experiments at the Tevatron and LEP colliders. © 2011 CMS Collaboration ; California Earthquake Authority Serbia Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro Fuel Cell Technologies Program, FCT Joint Institute for Nuclear Research, JINR Pakistan Atomic Energy Commission: Pakistan Consejo Nacional de Ciencia y Tecnología Institute for Research in Fundamental Sciences Foundation for Promotion of Material Science and Technology of Japan Hispanics in Philanthropy California Department of Fish and Game National Research Foundation Canadian Mathematical Society U.S. Department of Energy Academy of Finland Coordenação de Aperfeiçoamento de Pessoal de Nível Superior Türkiye Atom Enerjisi Kurumu NSC, Taipei Research Promotion Foundation: Cyprus National Science Foundation Science and Technology Facilities Council Human Growth Foundation Croatia Fundação de Amparo à Pesquisa do Estado de São Paulo Secretaría de Educación Pública Western Carolina University Fonds De La Recherche Scientifique - FNRS National Natural Science Foundation of China Bundesministerium für Bildung und Forschung Ministerio de Ciencia e Innovación, MICINN Instituto Nazionale di Fisica Nucleare Hungarian Scientific Research Fund Department of Atomic Energy, Government of India Department of Science and Technology, Government of Rajasthan Conselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq Canadian Anesthesiologists' Society Departamento Administrativo de Ciencia, Tecnología e Innovación, COLCIENCIAS Nemzeti Kutatási és Technológiai Hivatal, NKTH: Hungary CERN General Secretariat for Research and Technology, GSRT Fonds Wetenschappelijk Onderzoek Santa Fe Institute Ministry of Education and Science Louisiana Academy of Sciences ; We thank L. Dixon and the members of the Blackhat Collaboration for discussions concerning vector-boson + jets production at the LHC. 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); 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). --