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

0465616 - FZÚ 2017 RIV US eng J - Journal Article
Aaboud, M. - Aad, G. - Abbott, B. - Chudoba, Jiří - Havránek, Miroslav - Hejbal, Jiří - Jakoubek, Tomáš - Kepka, Oldřich - Kupčo, Alexander - Kůs, Vlastimil - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek - Vrba, Václav … Total 2861 authors
Search for resonances in diphoton events at √s=13 TeV with the ATLAS detector.
Journal of High Energy Physics. Roč. 2016, č. 9 (2016), s. 1-49, č. článku 001. ISSN 1029-8479. E-ISSN 1029-8479
Institutional support: RVO:68378271
Keywords : hadron-hadron scattering * beyond standard model * ATLAS * hard scattering * particle and resonance production * proton-proton scattering
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 6.063, year: 2016

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.

Permanent Link: http://hdl.handle.net/11104/0264089