Observation of the diphoton decay of the Higgs boson and measurement of its properties
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Khachatryan-2014-Observation of the d.pdf
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Author(s)
Apyan, Aram
Busza, Wit
Cali, Ivan Amos
Chan, M.
Di Matteo, Leonardo
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Gulhan, Doga Can
Klute, Markus
Lai, Yue Shi
Date Issued
October 2014
Journal
European Physical Journal C: Particles and Fields
Publisher
Springer-Verlag
Citation
Khachatryan, V., A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. Erö, et al. “Observation of the Diphoton Decay of the Higgs Boson and Measurement of Its Properties.” Eur. Phys. J. C 74, no. 10 (October 2014).
Version
Final published version
Abstract
Observation of the diphoton decay mode of the recently discovered Higgs boson and measurement of some of its properties are reported. The analysis uses the entire dataset collected by the CMS experiment in proton-proton collisions during the 2011 and 2012 LHC running periods. The data samples correspond to integrated luminosities of 5.1 fb [superscript -1] at √s = 7 TeV and 19.7 fb [superscript -1] at 8 TeV. A clear signal is observed in the diphoton channel at a mass close to 125 GeV with a local significance of 5.7σ , where a significance of 5.2σ is expected for the standard model Higgs boson. The mass is measured to be 124.70±0.34GeV=124.70±0.31(stat)±0.15(syst)GeV , and the best-fit signal strength relative to the standard model prediction is 1.14[superscript +0.26][subscript −0.23] = 1.14±0.21(stat) [superscript +0.09][subscript −0.05](syst) [superscript +0.13][subscript −0.09](theo) . Additional measurements include the signal strength modifiers associated with different production mechanisms, and hypothesis tests between spin-0 and spin-2 models.
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/10.1140/epjc/s10052-014-3076-z
