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
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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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Körperschaft: | |
| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2020
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| In: |
Physics letters
Year: 2020, Jahrgang: 800 |
| ISSN: | 1873-2445 |
| DOI: | 10.1016/j.physletb.2019.135082 |
| Online-Zugang: | Verlag, Volltext: https://doi.org/10.1016/j.physletb.2019.135082 Verlag: http://www.sciencedirect.com/science/article/pii/S0370269319308044 
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| Verfasserangaben: | The Atlas Collaboration. G. Aad [und weitere] |
MARC
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| 245 | 1 | 0 | |a 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 |c The Atlas Collaboration. G. Aad [und weitere] |
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| 246 | 3 | 3 | |a Search for flavour-changing neutral currents in processes with one top quark and a photon using 81 fb−1 of pp collisions at square root s=13TeV with the ATLAS experiment |
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| 500 | |a Available online 13 November 2019 | ||
| 500 | |a Im Titel steht der Buchstabe "s" unter dem Wurzelsymbol | ||
| 500 | |a Im Titel ist die Zahl "-1" als Hochzahl dargestellt | ||
| 500 | |a Gesehen am 25.02.2020 | ||
| 500 | |a 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] | ||
| 520 | |a 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). | ||
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