Observation of single-top-quark production in association with a photon using the ATLAS detector

0579126 - FZÚ 2024 RIV US eng J - Journal Article
Aad, G. - Abbott, B. - Abbott, D.C. - Chudoba, Jiří - Hejbal, Jiří - Jačka, Petr - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Latoňová, Věra - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … Total 2899 authors
Observation of single-top-quark production in association with a photon using the ATLAS detector.
Physical Review Letters. Roč. 131, č. 18 (2023), č. článku 181901. ISSN 0031-9007. E-ISSN 1079-7114
Research Infrastructure: CERN-CZ III - 90240
Institutional support: RVO:68378271
Keywords : ATLAS * quantum chromodynamics: perturbation theory * acceptance * photon: transverse momentum
OECD category: Particles and field physics
Impact factor: 8.6, year: 2022
Method of publishing: Open access

This Letter reports the observation of single top quarks produced together with a photon, which directly probes the electroweak coupling of the top quark. The analysis uses 139  fb-1 of 13 TeV proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider. Requiring a photon with transverse momentum larger than 20 GeV and within the detector acceptance, the fiducial cross section is measured to be 688±23(stat) -71+75(syst)  fb, to be compared with the standard model prediction of 515-42+36  fb at next-to-leading order in QCD.
Permanent Link: https://hdl.handle.net/11104/0347995