@Article{ATLASCollaborationAad_etal2023,
author="ATLAS Collaboration (Aad, G. et al
and Amos, K. R.
and Aparisi Pozo, J. A.
and Bailey, A. J.
and Cabrera Urban, S.
and Cantero, J.
and Cardillo, F.
and Castillo Gimenez, V.
and Costa, M. J.
and Didenko
and Escobar, C.
and Fiorini, L.
and Fullana Torregrosa, E.
and Fuster, J.
and Garcia, C.
and Garcia Navarro, J. E.
and Gomez Delegido, A. J.
and Gonzalez de la Hoz, S.
and Gonzalvo Rodriguez, G. R.
and Guerrero Rojas, J. G. R.
and Higon-Rodriguez, E.
and Lacasta, C.
and Lozano Bahilo, J. J.
and Marti-Garcia, S.
and Martinez Agullo, P.
and Miralles Lopez, M.
and Mitsou, V. A.
and Monsonis Romero, L.
and Moreno Llacer, M.
and Munoz Perez, D.
and Navarro-Gonzalez, J.
and Poveda, J.
and Prades Iba{\~{n}}ez, A.
and Rubio Jimenez, A.
and Ruiz-Martinez, A.
and Sabatini, P.
and Salt, J.
and Sanchez Sebastian, V.
and Sayago Galvan, I.
and Senthilkumar, V.
and Soldevila, U.
and Sanchez, J.
and Torro Pastor, E.
and Valero, A.
and Valls Ferrer, J. A.
and Varriale, L.
and Villaplana Perez, M.
and Vos, M.",
title="Search for flavour-changing neutral-current couplings between the top quark and the photon with the ATLAS detector at root s=13 TeV",
journal="Physics Letters B",
year="2023",
publisher="Elsevier",
volume="842",
pages="137379--22pp",
abstract="This letter documents a search for flavour-changing neutral currents (FCNCs), which are strongly sup-pressed in the Standard Model, in events with a photon and a top quark with the ATLAS detector. The analysis uses data collected in pp collisions at {\&} RADIC;s =13 TeV during Run 2 of the LHC, corresponding to an integrated luminosity of 139 fb-1. Both FCNC top-quark production and decay are considered. The final state consists of a charged lepton, missing transverse momentum, a b-tagged jet, one high-momentum photon and possibly additional jets. A multiclass deep neural network is used to classify events either as signal in one of the two categories, FCNC production or decay, or as background. No significant ex-cess of events over the background prediction is observed and 95{\%} CL upper limits are placed on the strength of left-and right-handed FCNC interactions. The 95{\%} CL bounds on the branching fractions for the FCNC top-quark decays, estimated (expected) from both top-quark production and decay, are B(t {\&} RARR; u {\&} gamma; ) < 0.85 (0.88+0.37 -0.25) x 10-5 and B(t {\&} RARR; c {\&} gamma; ) < 4.2 (3.40+1.35-0.95) x 10-5 for a left-handed tq {\&} gamma; cou-pling, and B(t {\&} RARR; u {\&} gamma; ) < 1.2 (1.20+0.50 -0.33) x10-5 and B(t {\&} RARR; c {\&} gamma; ) < 4.5 (3.70+1.47 -1.03) x10-5 for a right-handed coupling.",
optnote="WOS:001023760300001",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=5634), last updated on Fri, 15 Sep 2023 12:51:15 +0000",
issn="0370-2693",
doi="10.1016/j.physletb.2022.137379",
opturl="https://arxiv.org/abs/2205.02537",
opturl="https://doi.org/10.1016/j.physletb.2022.137379",
language="English"
}