Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC

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• 作者：CMS Collaboration ; S. Chatrchyan ; V. Khachatryan ; A.M. Sirunyan ; A. Tumasyan ; W. Adam ; E. Aguilo ; T. Bergauer ; M. Dragicevic ; J. Er? ; C. Fabjan ; M. Friedl ; R. Fr¨¹hwirth ; V.M. Ghete ; J. Hammer ; M. Hoch ; N. H?rmann ; J. Hrubec ; M. Jeitler ; W. Kiesenhofer ; et al.
• 关键词：CMS ; Physics ; Higgs
• 刊名：Physics Letters B
• 出版年：2012
• 出版时间：17 September, 2012
• 年：2012
• 卷：716
• 期：1
• 页码：30-61
• 全文大小：1123 K

文摘

Results are presented from searches for the standard model Higgs boson in proton-proton collisions at 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: m>¦Ã¦Ãm>, ZZ, , , and . 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, m>¦Ã¦Ãm> and ZZ; a fit to these signals gives a mass of . The decay to two photons indicates that the new particle is a boson with spin different from one.