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|Title:||Search for flavour-changing neutral current top-quark decays t → qZ in proton-proton collisions at √s=13 TeV with the ATLAS detector|
|Other Titles:||Search for flavour-changing neutral current top-quark decays t -> qZ in proton-proton collisions at root s=13 TeV with the ATLAS detector|
|Citation:||Journal of High Energy Physics, 2018; 2018(7):1-41|
|M. Aaboud … Damir Duvnjak … Paul D. Jackson … Jason L. Oliver … Andreas Petridis … Abhishek Sharma … Martin White … et al. (The ATLAS Collaboration)|
|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 fb−1 , are analysed. The search is performed using topquark pair events, with one top quark decaying through the t → qZ (q = u, c) flavourchanging neutral-current channel, and the other through the dominant Standard Model mode t → bW. 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), at least two jets, one of the jets originating from a b-quark, and missing transverse momentum from the undetected neutrino. The data are consistent with Standard Model background contributions, and at 95% confidence level the search sets observed (expected) upper limits of 1.7 × 10−4 (2.4 × 10−4 ) on the t → uZ branching ratio and 2.4 × 10−4 (3.2 × 10−4 ) on the t → cZ branching ratio, constituting the most stringent limits to date.|
|Keywords:||Hadron-Hadron scattering (experiments)|
|Rights:||This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.|
|Appears in Collections:||Physics publications|
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