Observation of light-by-light scattering in ultraperipheral Pb plus Pb collisions with the ATLAS detector

0519350 - FZÚ 2020 RIV US eng J - Journal Article
Aad, G. - Abbott, B. - Abbott, D.C. - Chudoba, Jiří - Hejbal, Jiří - Hladík, Ondřej - Jačka, Petr - Jakoubek, Tomáš - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … Total 2929 authors
Observation of light-by-light scattering in ultraperipheral Pb plus Pb collisions with the ATLAS detector.
Physical Review Letters. Roč. 123, č. 5 (2019), s. 1-21, č. článku 052001. ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA MŠMT LM2015058
Institutional support: RVO:68378271
Keywords : ATLAS * transverse momentum * photon: transverse energy * CERN LHC Coll * peripheral * planarity
OECD category: Particles and field physics
Impact factor: 8.385, year: 2019
Method of publishing: Open access

This Letter describes the observation of the light-by-light scattering process, γγ→γγ, in Pb+Pb collisions at sNN=5.02  TeV. The analysis is conducted using a data sample corresponding to an integrated luminosity of 1.73  nb-1, collected in November 2018 by the ATLAS experiment at the LHC. Light-by-light scattering candidates are selected in events with two photons produced exclusively, each with transverse energy ETγ>3  GeV and pseudorapidity |ηγ|<2.4, diphoton invariant mass above 6 GeV, and small diphoton transverse momentum and acoplanarity. After applying all selection criteria, 59 candidate events are observed for a background expectation of 12±3 events.



Permanent Link: http://hdl.handle.net/11104/0304344