Observation of Single-Top-Quark Production in Association with a Photon Using the ATLAS Detector

Summary, in English

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.

• Author: G. Aad; T.P.A. Åkesson; Eric Edward Corrigan; Caterina Doglioni; Alexander Ekman; Jannik Geisen; Vincent Hedberg; Göran Jarlskog; Balazs Konya; Else Lytken; Katja Mankinen; Caterina Marcon; Ulf Mjörnmark; Geoffrey André Adrien Mullier; Ruth Pöttgen; Nathan Daniel Simpson; Eleni Skorda; Oxana Smirnova; L. Zwalinski
• Department/s: Particle and nuclear physics; eSSENCE: The e-Science Collaboration; Department of Physics
• Publishing year: 2023
• Language: English
• Publication/Series: Physical Review Letters
• Volume: 131
• Issue: 18
• Links: http://dx.doi.org/10.1103/PhysRevLett.131.181901
• Document type: Journal article
• Publisher: American Physical Society
• Topic: Subatomic Physics
• Keywords: article; human; photon; quark
• Status: Published
• ISBN/ISSN/Other: ISSN: 1079-7114