Observation of a new boson with mass near 125 GeV in pp collisions at √s =7 and 8 TeV
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13130_2013_Article_6284.pdf
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Author(s)
Chatrchyan, S.
Khachatryan, V.
Sirunyan, A. M.
Tumasyan, A.
Adam, W.
Bergauer, T.
Dragicevic, M.
Erö, J.
Fabjan, C.
Friedl, M.
Date Issued
June 2013
Journal
Journal of High Energy Physics
Publisher
Springer-Verlag/SISSA
Citation
Chatrchyan, S.; Khachatryan, V.; Sirunyan, A. M. et al. “Observation of a New Boson with Mass near 125 GeV in Pp Collisions at √s =7 and 8 TeV.” Journal of High Energy Physics 2013, 6 (June 2013): 81 © 2013 CERN for the benefit of the CMS collaboration
Version
Final published version
Abstract
A detailed description is reported of the analysis used by the CMS Collaboration in the search for the standard model Higgs boson in pp collisions at the LHC, which led to the observation of a new boson. The data sample corresponds to integrated luminosities up to 5.1 fb⁻¹ at √s =7
TeV, and up to 5.3 fb⁻¹ at √s =8 TeV. The results for five Higgs boson decay modes γγ, ZZ, WW, ττ, and bb, which show a combined local significance of 5 standard deviations near 125 GeV, are reviewed. A fit to the invariant mass of the two high resolution channels, γγ and ZZ → 4ℓ, gives a mass estimate of 125.3 ± 0.4 (stat.) ± 0.5 (syst.) GeV. The measurements are interpreted in the context of the standard model Lagrangian for the scalar Higgs field interacting with fermions and vector bosons. The measured values of the corresponding couplings are compared to the standard model predictions. The hypothesis of custodial symmetry is tested through the measurement of the ratio of the couplings to the W and Z bosons. All the results are consistent, within their uncertainties, with the expectations for a standard model Higgs boson.
MIT Department
Lincoln Laboratory
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
http://dx.doi.org/10.1007/JHEP06(2013)081
