TY - GEN AU - Aad, G. AU - Aguilar Saavedra, Juan Antonio AU - Rodríguez Chala, Mikael AU - Atlas Collaboration PY - 2023 UR - https://hdl.handle.net/10481/86034 AB - 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... LA - eng PB - American Physical Society TI - Observation of Single-Top-Quark Production in Association with a Photon Using the ATLAS Detector DO - 10.1103/PhysRevLett.131.181901 ER -