# Search for resonances in diphoton events at $\sqrt{s}$=13 TeV with the ATLAS detector

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.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-01331581
Contributor : Claudine Bombar <>
Submitted on : Tuesday, June 14, 2016 - 9:50:09 AM
Last modification on : Tuesday, May 11, 2021 - 11:36:49 AM

### Citation

M. Aaboud, Z. Barnovska, N. Berger, M. Delmastro, L. Di Ciaccio, et al.. Search for resonances in diphoton events at $\sqrt{s}$=13 TeV with the ATLAS detector. Journal of High Energy Physics, Springer Verlag (Germany), 2016, 09, pp.001. ⟨10.1007/JHEP09(2016)001⟩. ⟨in2p3-01331581⟩

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