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) +75 −71(syst) fb, to be compared with the standard model prediction of 515+36 −42 fb at next-to-leading order in QCD.
Observation of Single-Top-Quark Production in Association with a Photon Using the ATLAS Detector
GONELLA, Laura
2023-01-01
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) +75 −71(syst) fb, to be compared with the standard model prediction of 515+36 −42 fb at next-to-leading order in QCD.File in questo prodotto:
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PhysRevLett.131.181901.pdf
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Supplementary.pdf
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