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

Khachatryan, V.; Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Bergauer, T.; Dragicevic, M.; Erö, J.; Fabjan, C.; Friedl, M.; Frühwirth, R.; Ghete, V.M.; Hartl, C.; Hörmann, N.; Hrubec, J.; Jeitler, M.; Kiesenhofer, W.; Knünz, V.; Krammer, M.; Krätschmer, I.; Liko, D.; ... mehr

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-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 5.7&#963; , where a significance of 5.2&#963; 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 1.14-0.23+0.26=1.14±0.21(stat) -0.05+0.09(syst) -0.09+0.13(theo) . Additional measurements include the signal strength modifiers associated with different production mechanisms, and hypothesis tests between spin-0 and spin-2 models.

 Zugehörige Institution(en) am KIT Institut für Experimentelle Kernphysik (IEKP) Publikationstyp Zeitschriftenaufsatz Jahr 2014 Sprache Englisch Identifikator ISSN: 1434-6044KITopen ID: 1000044639 Erschienen in The European Physical Journal C Band 74 Heft 10 Seiten 3076 Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
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