Observation of the diphoton decay of the Higgs boson and measurement of its properties
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; Ma, Teng; Paus, Christoph M. E.; Ralph, Duncan Kelley; Stephans, George S. F.; Velicanu, Dragos Alexandru; Veverka, Jan; Wyslouch, Boleslaw; Yoon, A. S.; Zanetti, Marco; Stoeckli, Fabian; Sumorok, Konstanty C; Yang, Mingming; Wyslouch, Victoria; Barbieri, Richard Alexander; Bauer, Gerry P; Dutta, Valentina; Lee, Yen-Jie; Levin, Andrew Michael; Luckey Jr, P David; Roland, Christof E; Roland, Gunther M; ... Show more Show less![Thumbnail](/bitstream/handle/1721.1/94588/Khachatryan-2014-Observation%20of%20the%20d.pdf.jpg?sequence=4&isAllowed=y)
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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 [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.
Date issued
2014-10Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of ScienceJournal
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
ISSN
1434-6044
1434-6052