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Search for resonances in diphoton events at $\sqrts$=13 TeV with the ATLAS detector

Submit Time: 2016-08-29
Author: Aaboud, Morad and others 1 ;
Institute: 1.ATLAS Collaboration;


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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Keywords: ATLAS detector;
Recommended references: Aaboud, Morad and others.(2016).Search for resonances in diphoton events at $\sqrts$=13 TeV with the ATLAS detector.[ChinaXiv:201608.00178] (Click&Copy)
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[V1] 2016-08-29 08:50:27 chinaXiv:201608.00178V1 Download
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