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

Khachatryan, A. M.

doi:10.1140/epjc/s10052-014-3076-z

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

Journal Article · Wed Oct 15 00:00:00 EDT 2014 · European Physical Journal. C, Particles and Fields

DOI:https://doi.org/10.1140/epjc/s10052-014-3076-z· OSTI ID:1156529

Khachatryan, A. M. ^[1]

Yerevan Physics Inst. (YerPhI), Yerevan (Armenia). et al.

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 5.1fb^-1 at √s=7 TeV and 19.7fb^-1 at 8TeV. A clear signal is observed in the diphoton channel at a mass close to 125GeV 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 ± 0.34 GeV = 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). Thus, additional measurements include the signal strength modifiers associated with different production mechanisms, and hypothesis tests between spin-0 and spin-2 models.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: The CMS Collaboration

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1156529

Report Number(s):: FERMILAB-PUB-14-251-CMS; CERN-PH-EP-2014-117; CMS-HIG-13-001; arXiv eprint number arXiv:1407.0558

Journal Information:: European Physical Journal. C, Particles and Fields, Vol. 74, Issue 10; ISSN 1434-6044

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 296 works

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