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Article
Report number arXiv:1803.09923 ; CERN-EP-2018-018
Title Search for flavour-changing neutral current top-quark decays tqZ in proton-proton collisions at s=13 TeV with the ATLAS detector
Author(s) ATLAS Collaboration  Vis alle 2869 forfattere
Publication 2018-07-31
Imprint 24 Mar 2018
Number of pages 42
Note 42 pages in total, author list starting page 26, 4 figures, 11 tables, submitted to JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2017-06
In: JHEP 07 (2018) 176
DOI 10.1007/JHEP07(2018)176
Subject category Particle Physics - Experiment ; hep-ex
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Free keywords flavor physics ; top physics ; experimental results
Abstract A search for flavour-changing neutral-current processes in top-quark decays is presented. Data collected with the ATLAS detector from proton-proton collisions at the Large Hadron Collider at a centre-of-mass energy of s=13 TeV, corresponding to an integrated luminosity of 36.1 fb1, are analysed. The search is performed using top-quark pair events, with one top quark decaying through the tqZ (q=u,c) flavour-changing neutral-current channel, and the other through the dominant Standard Model mode tbW. Only Z boson decays into charged leptons and leptonic W boson decays are considered as signal. Consequently, the final-state topology is characterized by the presence of three isolated charged leptons (electrons or muons) and at least two jets, one of the jets originating from a b-quark. The data are consistent with Standard Model background contributions, and at 95% confidence level the search sets observed (expected) upper limits of 1.7×104 (2.4×104) on the tuZ branching ratio and 2.4×104 (3.2×104) on the tcZ branching ratio, constituting the most stringent limits to date.
Copyright/License publication: (License: CC-BY-4.0)
Preprint: © 2018-2025 CERN (License: CC-BY-4.0)



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Email contact: fmalek@lpsc.in2p3.fr


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