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

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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...

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Main Authors: Aad, Georges (Author) , Anders, Christoph (Author) , Andrei, George Victor (Author) , Antel, Claire (Author) , Bolz, Arthur (Author) , Dunford, Monica (Author) , Ferreira de Lima, Danilo Enoque (Author) , Franchino, Silvia (Author) , Geisler, Manuel Patrice (Author) , Helary, Louis (Author) , Jongmanns, Jan (Author) , Klassen, Martin (Author) , Kolb, Mathis (Author) , Krishnan, Anjali (Author) , Kugel, Andreas (Author) , Lisovyi, Mykhailo (Author) , Meyer zu Theenhausen, Hanno (Author) , Napolitano, Fabrizio (Author) , Ott, Philipp (Author) , S̜ahinsoy, Merve (Author) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author) , Spieker, Thomas (Author) , Stamen, Rainer (Author) , Starovoitov, Pavel (Author) , Suchek, Stanislav (Author) , Vigani, Luigi (Author) , Wang, Jike (Author) , Weber, Sebastian (Author) , Wessels, Martin (Author) , Yue, Xiaoguang (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 2020
In: Physics letters
Year: 2020, Volume: 800
ISSN:1873-2445
DOI:10.1016/j.physletb.2019.135082
Online Access:Verlag, Volltext: https://doi.org/10.1016/j.physletb.2019.135082
Verlag: http://www.sciencedirect.com/science/article/pii/S0370269319308044
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Author Notes:The Atlas Collaboration. G. Aad [und weitere]
Description
Summary: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. These are also interpreted as 95% CL upper limits on the cross section for FCNC tγ production via a left-handed (right-handed) tuγ coupling of 36 fb (78 fb) and on the branching ratio for t→γu of 2.8×10−5 (6.1×10−5). In addition, they are interpreted as 95% CL upper limits on the cross section for FCNC tγ production via a left-handed (right-handed) tcγ coupling of 40 fb (33 fb) and on the branching ratio for t→γc of 22×10−5 (18×10−5).
Item Description:Available online 13 November 2019
Im Titel steht der Buchstabe "s" unter dem Wurzelsymbol
Im Titel ist die Zahl "-1" als Hochzahl dargestellt
Gesehen am 25.02.2020
The ATLAS Collaboration: C. Anders, V. Andrei, C. Antel, A. Bolz, M. Dunford, D.E. Ferreira de Lima, S. Franchino, M.P. Geisler, L. Helary [und weitere]
Physical Description:Online Resource
ISSN:1873-2445
DOI:10.1016/j.physletb.2019.135082

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