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Observation of Single-Top-Quark Production in Association with a Photon Using the ATLAS Detector
G Aad1, B Abbott2, D C Abbott3
1CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France.
Abstract:
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.
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