Search for new phenomena in events with at least three photons collected in <i>pp</i> collisions at √<i>s</i>=8 TeV with the ATLAS detector



Aad, G, Abbott, B, Abdallah, J, Abdinov, O, Aben, R, Abolins, M, AbouZeid, OS, Abramowicz, H, Abreu, H, Abreu, R
et al (show 2863 more authors) (2016) Search for new phenomena in events with at least three photons collected in <i>pp</i> collisions at √<i>s</i>=8 TeV with the ATLAS detector. EUROPEAN PHYSICAL JOURNAL C, 76 (4). 210-.

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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[Formula: see text], 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 [Formula: see text], 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 (<i>a</i>), limits are found to be [Formula: see text] for 10 GeV [Formula: see text] 62 GeV. Limits are also presented for Higgs boson-like scalars (<i>H</i>) for [Formula: see text] 125 GeV, and for a [Formula: see text] decaying to three photons via [Formula: see text]. Additionally, the observed limit on the branching ratio of the <i>Z</i> boson decay to three photons is found to be BR[Formula: see text], a result five times stronger than the previous result from LEP.

Item Type: Article
Additional Information: 20 pages plus author list + cover pages (37 pages total), 5 figures, 5 tables, submitted to EPJC; all figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2013-24/
Uncontrolled Keywords: ATLAS Collaboration, ATLAS Collaboration, ATLAS Collaboration
Depositing User: Symplectic Admin
Date Deposited: 14 Mar 2017 11:46
Last Modified: 11 Oct 2023 16:58
DOI: 10.1140/epjc/s10052-016-4034-8
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3006379