Search for new phenomena in events with at least three photons collected in pp collisions at √s = 8 TeV with the ATLAS detector
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Search for new.pdf
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2.08 MB
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Author(s)
Taylor, Frank E
Date Issued
April 2016
Journal
The European Physical Journal C
Publisher
Springer-Verlag
Citation
ATLAS Collaboration et al. “Search for New Phenomena in Events with at Least Three Photons Collected in Pp Collisions at √s = 8 TeV with the ATLAS Detector.” The European Physical Journal C 76.4 (2016): n. pag. © 2016 CERN for the benefit of the ATLAS collaboration
Version
Final published version
Abstract
Results of a search for new phenomena in events with at least three photons are reported. Data from proton–proton collisions at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb [superscript −1], were collected with the ATLAS detector at the LHC. The observed data are well described by the Standard Model. Limits at the 95 % confidence level on new phenomena are presented based on the rate of events in an inclusive signal region and a restricted signal region targeting the rare decay Z→3γ, as well as di-photon and tri-photon resonance searches. For a Standard Model Higgs boson decaying to four photons via a pair of intermediate pseudoscalar particles (a), limits are found to be σ × BR (h→aa)× BR (a→γγ)[superscript 2]<10[superscript −3]σ[subscript SM] for 10 GeV 125 GeV, and for a Z′ decaying to three photons via Z′→a+γ→3γ. Additionally, the observed limit on the branching ratio of the Z boson decay to three photons is found to be BR (Z→3γ)<2.2×10[superscript −6], a result five times stronger than the previous result from LEP.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-016-4034-8
