@article{619034b5522e4a5482e59a9e3fc877d1,
title = "Observation of Single-Top-Quark Production in Association with a Photon Using the ATLAS Detector",
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\textasciicircum{}\{-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\}\textasciicircum{}\{+75\}(syst) fb, to be compared with the standard model prediction of 515\_\{-42\}\textasciicircum{}\{+36\} fb at next-to-leading order in QCD.",
author = "\{ATLAS Collaboration\} and G. Aad and B. Abbott and Abbott, \{D. C.\} and K. Abeling and Abidi, \{S. H.\} and A. Aboulhorma and H. Abramowicz and H. Abreu and Y. Abulaiti and \{Abusleme Hoffman\}, \{A. C.\} and Acharya, \{B. S.\} and B. Achkar and L. Adam and \{Adam Bourdarios\}, C. and L. Adamczyk and L. Adamek and Addepalli, \{S. V.\} and J. Adelman and A. Adiguzel and S. Adorni and T. Adye and Affolder, \{A. A.\} and Y. Afik and Agaras, \{M. N.\} and J. Agarwala and A. Aggarwal and C. Agheorghiesei and Aguilar-Saavedra, \{J. A.\} and A. Ahmad and F. Ahmadov and Ahmed, \{W. S.\} and S. Ahuja and X. Ai and G. Aielli and I. Aizenberg and M. Akbiyik and {\AA}kesson, \{T. P.A.\} and Akimov, \{A. V.\} and \{Al Khoury\}, K. and Alberghi, \{G. L.\} and J. Albert and P. Albicocco and \{Alconada Verzini\}, \{M. J.\} and S. Alderweireldt and M. Aleksa and Aleksandrov, \{I. N.\} and C. Alexa and T. Alexopoulos and A. Alfonsi and Connell, \{S. H.\}",
year = "2023",
month = nov,
day = "3",
doi = "10.1103/PhysRevLett.131.181901",
language = "English",
volume = "131",
pages = "181901",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "18",
}