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Search for new phenomena in events with at least three photons collected in pp collisions at s√s = 8 TeV with the ATLAS detector
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ATLAS Collaboration (Including: Beckingham, M., Farrington, Sinead, Harrison, P. F., Jeske, C., Jones, G. (Graham), Martin, T. A., Murray, W., Pianori, E. and Spangenberg, Martin). (2016) Search for new phenomena in events with at least three photons collected in pp collisions at s√s = 8 TeV with the ATLAS detector. The European Physical Journal C, 76 . 210. doi:10.1016/j.physletb.2016.04.050
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WRAP_art%3A10.1140%2Fepjc%2Fs10052-016-4034-8.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (2443Kb) | Preview |
Official URL: http://dx.doi.org/10.1140/epjc/s10052-016-4034-8
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 −1−1 , 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→3γZ→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)2<10−3σSMσ× BR (h→aa)× BR (a→γγ)2<10−3σSM for 10 GeV <ma<<ma< 62 GeV. Limits are also presented for Higgs boson-like scalars (H) for mH>mH> 125 GeV, and for a Z′Z′ decaying to three photons via Z′→a+γ→3γZ′→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)<2.2×10−6(Z→3γ)<2.2×10−6 , a result five times stronger than the previous result from LEP.
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