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Search for flavour-changing neutral currents in processes with one top quark and a photon using 81 fb.sup.-1./sup. of pp collisions at √s=13 TeV with the ATLAS experiment

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    0534043 - FZÚ 2021 RIV NL eng J - Journal Article
    Aad, G. - Abbott, B. - Abbott, D.C. - Chudoba, Jiří - Hejbal, Jiří - Hladík, Ondřej - Jačka, Petr - Jakoubek, Tomáš - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek
    Search for flavour-changing neutral currents in processes with one top quark and a photon using 81 fb-1 of pp collisions at √s=13 TeV with the ATLAS experiment.
    Physics Letters. B. Roč. 800, Jan (2020), s. 1-21, č. článku 135082. ISSN 0370-2693
    R&D Projects: GA MŠk(CZ) LTT17018
    Research Infrastructure: CERN-CZ II - 90104
    Institutional support: RVO:68378271
    Keywords : ATLAS * effective field theory * coupling constant: upper limit * statistical analysis * neural network * CERN LHC Coll * kinematics * background
    Subject RIV: BF - Elementary Particles and High Energy Physics
    OBOR OECD: Particles and field physics
    Impact factor: 4.384, year: 2019
    http://hdl.handle.net/11104/0312275

    A search for flavour-changing neutral current (FCNC) events via the coupling of a top quark, a photon, and an up or charm quark is presented using 81 fb −1 of proton–proton collision data taken at a centre-of-mass energy of 13 TeV with the ATLAS detector at the LHC. Events with a photon, an electron or muon, a b -tagged jet, and missing transverse momentum are selected. A neural network based on kinematic variables differentiates between events from signal and background processes. The data are consistent with the background-only hypothesis, and limits are set on the strength of the tqγ coupling in an effective field theory.
    Permanent Link: http://hdl.handle.net/11104/0312275
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