Search for resonances in diphoton events at √<i>s</i>=13TeV with the ATLAS detector



Aaboud, M, Aad, G, Abbott, B, Abdallah, J, Abdinov, O, Abeloos, B, Aben, R, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2851 more authors) (2016) Search for resonances in diphoton events at √<i>s</i>=13TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 09 (9). 001-.

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Abstract

Searches for new resonances decaying into two photons in the ATLAS experiment at the CERN Large Hadron Collider are described. The analysis is based on proton--proton collision data corresponding to an integrated luminosity of 3.2 fb$^{-1}$ at $\sqrt{s} = 13$ TeV recorded in 2015. Two searches are performed, one targeted at a spin-2 particle of mass larger than 500 GeV, using Randall--Sundrum graviton states as a benchmark model, and one optimized for a spin-0 particle of mass larger than 200 GeV. Varying both the mass and the decay width, the most significant deviation from the background-only hypothesis is observed at a diphoton invariant mass around 750 GeV with local significances of 3.8 and 3.9 standard deviations in the searches optimized for a spin-2 and spin-0 particle, respectively. The global significances are estimated to be 2.1 standard deviations for both analyses. The consistency between the data collected at 13 TeV and 8 TeV is also evaluated. Limits on the production cross section times branching ratio to two photons for the two resonance types are reported.

Item Type: Article
Additional Information: 32 pages plus author list (49 pages total), 12 figures, 2 tables, published version, all figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2016-08/
Uncontrolled Keywords: Beyond Standard Model, Hadron-Hadron scattering (experiments), Hard scattering, Particle and resonance production, proton-proton scattering
Depositing User: Symplectic Admin
Date Deposited: 16 Mar 2017 11:01
Last Modified: 05 Oct 2023 11:19
DOI: 10.1007/JHEP09(2016)001
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3006423