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

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 … Total 2932 authors
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. E-ISSN 1873-2445
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
OECD category: Particles and field physics
Impact factor: 4.771, year: 2020
Method of publishing: Open access

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