Search for new phenomena in events with at least three photons collected in pp collisions at √s=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 pp collisions at √s=8 TeV with the ATLAS detector EUROPEAN PHYSICAL JOURNAL C, 76 (4). 210-. ISSN 1434-6044, 1434-6052

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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<sup>−1</sup>, 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 → γ γ)<sup>2</sup>< 10<sup>−3</sup>σSM for 10 GeV < ma < 62 GeV. Limits are also presented for Higgs boson-like scalars (H) for mH > 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<sup>−6</sup>, 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: 24 Jun 2026 20:29
DOI: 10.1140/epjc/s10052-016-4034-8
Related Websites:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3006379
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