Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/124571
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Type: | Journal article |
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 |
Author: | Aaboud, M. Aad, G. Abbott, B. Abdinov, O. Abeloos, B. Abidi, S.H. AbouZeid, O.S. Abraham, N.L. Abramowicz, H. Abreu, H. Abulaiti, Y. Acharya, B.S. Adachi, S. Adamczyk, L. Adelman, J. Adersberger, M. Adye, T. Affolder, A.A. Afik, Y. Agheorghiesei, C. et al. |
Citation: | The Journal of High Energy Physics, 2018; 2018(7):1-41 |
Publisher: | Springer |
Issue Date: | 2018 |
ISSN: | 1126-6708 1029-8479 |
Statement of Responsibility: | 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. |
DOI: | 10.1007/JHEP07(2018)176 |
Published version: | http://dx.doi.org/10.1007/jhep07(2018)176 |
Appears in Collections: | Aurora harvest 8 Physics publications |
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hdl_124571.pdf | Published version | 1.37 MB | Adobe PDF | View/Open |
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