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Search for resonances in diphoton events at √𝑠=13 TeV with the ATLAS detector
Aaboud, M. Royon, Christophe The ATLAS collaboration
Aaboud, M.
Royon, Christophe
The ATLAS collaboration
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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 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.
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2016-09-01
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Springer Verlag
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The ATLAS collaboration., Aaboud, M., Aad, G. et al. Search for resonances in diphoton events at √𝑠=13 TeV with the ATLAS detector. J. High Energ. Phys. 2016, 1 (2016). https://doi.org/10.1007/JHEP09(2016)001