Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.11851/3622
Title: Search for flavour-changing neutral current top-quark decays t › qZ in proton-proton collisions at ?s=13 TeV with the ATLAS detector
Authors: The ATLAS Collaboration
Sultansoy, Saleh
Keywords: Collisions
jets
proton–proton collisions
Issue Date: Jul-2018
Publisher: Springer Verlag
Source: ATLAS collaboration. (2018). Search for flavour-changing neu tral curren t top-quark decays t? qZ in pro ton-pro ton collisions at $$\sqr t {s}= 13$$ TeV wi th the ATLAS de tec tor. Journal of High Energy Physics, 2018(7), 176.
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 top-quark pair events, with one top quark decaying through the t ? qZ (q = u, c) flavour-changing 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.[Figure not available: see fulltext.]. © 2018, The Author(s).
URI: https://link.springer.com/article/10.1007%2FJHEP07%282018%29176
https://hdl.handle.net/20.500.11851/3622
ISSN: 11266708
Appears in Collections:Malzeme Bilimi ve Nanoteknoloji Mühendisliği Bölümü / Department of Material Science & Nanotechnology Engineering
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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