: 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.
Observation of Single-Top-Quark Production in Association with a Photon Using the ATLAS Detector / Add, G., Aloisio, A., Alviggi, M., Auricchio, S., Canale, V., Cirotto, F., Della Pietra, M., Merola, L., Massarotti, P., Rossi, E., Conventi, F., Izzo, V., Sekhniaidze, G.G., Camerlingo, M.T., Iengo, P., Di Donato, C., De Asmundis, R., Carlino, G., Doria, A., Al, E.t., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 131:18(2023), p. 181901. [10.1103/PhysRevLett.131.181901]
Observation of Single-Top-Quark Production in Association with a Photon Using the ATLAS Detector
A. Aloisio;M. Alviggi;S. Auricchio;V. Canale;F. Cirotto;M. Della Pietra;L. Merola;P. Massarotti;E. Rossi;LOFFREDO, Salvatore
2023
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
