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Search for resonances in diphoton events at √s = 13 TeV with the ATLAS detector
ATLAS Collaboration
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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Date
2016-09-01
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Springer Verlag
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Keywords
Hadron-Hadron scattering (experiments), Beyond Standard Model, Hard scattering, Particle and resonance production, Proton-proton scattering
Citation
The ATLAS collaboration, Aaboud, M., Aad, G. et al. J. High Energ. Phys. (2016) 2016: 1. https://doi.org/10.1007/JHEP09(2016)001