Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
BMWF (Austria) ; FWF (Austria) ; Fonds de la Recherche Scientifique (FNRS) ; FWO (Belgium) ; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) ; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) ; Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ) ; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) ; MES (Bulgaria) ; Organisation Européenne pour la Recherche Nucléaire (CERN) ; Chinese Academy of Sciences (CAS) ; MoST, (China) ; National Natural Science Foundation of China (NSFC) ; COLCIENCIAS (Colombia) ; MSES (Croatia) ; Research Promotion Foundation (RPF) ; MEYS (Czech Republic) ; MoER, (Estonia) ; European Regional Development Fund (ERDF) ; Academy of Finland ; MEC, (Finland) ; Helsinki Institute of Physics (HIP) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA) ; Institut national de physique nucléaire et de physique des particules (IN2P3/CNRS) ; Bundesministerium für Bildung und Forschung (BMBF) ; Deutsche Forschungsgemeinschaft (DFG) ; HGF (Germany) ; General Secretariat for Research and Technology (GSRT) ; Hungarian Scientific Research Fund (OTKA) ; NKTH (Hungary) ; Department of Atomic Energy (DAE) - India ; Department of Science and Technology (DST) - India ; Institute for Research in Fundamental Sciences (IPM) ; Science Foundation Ireland (SFI) ; Istituto Nazionale di Fisica Nucleare (INFN) ; NRF (Republic of Korea) ; WCU (Republic of Korea) ; LAS (Lithuania) ; Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV) ; Consejo Nacional de Ciencia y Tecnología (CONACYT) ; SEP, (Mexico) ; UASLP-FAI (Mexico) ; MSI (New Zealand) ; Pakistan Atomic Energy Commission (PAEC) ; MSHE (Poland) ; NSC (Poland) ; Fundação para a Ciência e a Tecnologia (FCT) ; Joint Institute for Nuclear Research (JINR) ; MON, (Russia) ; Rosatom State Atomic Energy Corporation (ROSATOM) ; RAS, (Russia) ; Russian Foundation for Basic Research (RFBR) ; Ministry of Science and Technological Development (MSTD) - Serbia ; SEIDI (Spain) ; Centro Nacional de Física de Partículas, Astropartículas y Nuclear (CPAN) ; Swiss Funding Agencies (Switzerland) ; NSC (Taipei) ; Scientific and Technological Research Council of Turkey (TUBITAK) ; Türkiye Atom Enerjisi Kurumu (TAEK) ; NASU (Ukraine) ; Science and Technology Facilities Council (STFC) ; DOE (USA) ; National Science Foundation (NSF) - USA ; Marie-Curie programme ; European Research Council (European Union) ; Leventis Foundation ; A.P. Sloan Foundation ; Alexander von Humboldt Foundation ; Austrian Science Fund (FWF) ; Belgian Federal Science Policy Office ; Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium) ; Agentschap voor Innovatie door Wetenschap en Technologie (IWT) ; Council of Scientific and Industrial Research (CSIR) - India ; Compagnia di San Paolo (Torino) ; HOMING PLUS programme of Foundation for Polish Science ; European Union ; MoER: SF0690030s09 ; Results are presented from searches for the standard model Higgs boson in proton-proton collisions at root s = 7 and 8 TeV in the Compact Muon Solenoid experiment at the LHC, using data samples corresponding to integrated luminosities of up to 5.1 fb(-1) at 7 TeV and 5.3 fb(-1) at 8 TeV. The search is performed in five decay modes: gamma gamma, ZZ, W+W-, tau(+)tau(-), and b (b) over bar. An excess of events is observed above the expected background, with a local significance of 5.0 standard deviations, at a mass near 125 GeV, signalling the production of a new particle. The expected significance for a standard model Higgs boson of that mass is 5.8 standard deviations. The excess is most significant in the two decay modes with the best mass resolution, gamma gamma and ZZ; a fit to these signals gives a mass of 125.3 +/- 0.4(stat.) +/- 0.5(syst.) GeV. The decay to two photons indicates that the new particle is a boson with spin different from one. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.
