Observation of the diphoton decay of the Higgs boson and measurement of its properties

the CMS Collaboration, Jim Brooke, Emyr Clement, David Cussans, Henning Flaecher, Robert Frazier, Joel Goldstein, Mark Grimes, Greg Heath, Luke Kreczko, Chris Lucas, Zhaoxia Meng, David Newbold, Sudarshan Paramesvaran, Sergey Senkin, Vincent Smith

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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-1 at s√=7TeV and 19.7 fb-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+0.26−0.23=1.14±0.21(stat) +0.09−0.05(syst) +0.13−0.09(theo). Additional measurements include the signal strength modifiers associated with different production mechanisms, and hypothesis tests between spin-0 and spin-2 models.
Original languageEnglish
Article number3076
Number of pages49
JournalEuropean Physical Journal C: Particles and Fields
Publication statusPublished - 15 Oct 2014


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