Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
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Chatrchyan-2012-Observation of a new.pdf
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Author(s)
Apyan, Aram
Bendavid, Joshua L.
Busza, Wit
Butz, Erik M.
Cali, Ivan Amos
Chan, M.
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Hahn, Kristian Allan
Kim, Y.
Date Issued
August 2012
Journal
Physics Letters B
Publisher
Elsevier
Citation
Chatrchyan, S., V. Khachatryan, A.M. Sirunyan, A. Tumasyan, W. Adam, E. Aguilo, T. Bergauer, et al. “Observation of a New Boson at a Mass of 125 GeV with the CMS Experiment at the LHC.” Physics Letters B 716, no. 1 (September 2012): 30–61. © 2012 CERN
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Final published version
Abstract
Results are presented from searches for the standard model Higgs boson in proton–proton collisions at √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[superscript −1] at 7 TeV and 5.3 fb[superscript −1] at 8 TeV. The search is performed in five decay modes: γγ, ZZ, W[superscript +]W[superscript −], τ[superscript +]τ[superscript −], and b[bar over b]. 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, γγ 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. School of Science
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DOI of Published Version
https://doi.org/10.1016/j.physletb.2012.08.021
