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

Serguei Chatrchyan, Timothy A Barrass, Francis J D Bostock, Jim J Brooke, Emyr J Clement, David G Cussans, Henning U Flaecher, Robert J E Frazier, Joel Goldstein, Mark A Grimes, Greg P Heath, Helen F Heath, Luke Kreczko, W Lacesso, Simon Metson, David M Newbold, Kachanon Nirunpong, A Poll, Sergey Senkin, Vincent J SmithTom S Williams, The CMS Collaboration

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Results are presented from searches for the standard model Higgs boson in proton-proton collisions at sqrt(s)=7 and 8 TeV in the CMS experiment at the LHC, using data samples corresponding to integrated luminosities of up to 5.1 inverse femtobarns at 7 TeV and 5.3 inverse femtobarns at 8 TeV. The search is performed in five decay modes: gamma gamma, ZZ, WW, tau tau, and b b-bar. An excess of events is observed above the expected background, 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.
Original languageEnglish
Pages (from-to)30-61
JournalPhysics Letters B
Issue number1
Early online date18 Aug 2012
Publication statusPublished - 17 Sept 2012


  • higgs
  • CMS
  • physics


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