Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.11851/3130
Title: Search for top-quark decays t › Hq with 36 fb-1 of pp collision data at ?s = 13 TeV with the ATLAS detector
Authors: The ATLAS Collaboration
Sultansoy, Saleh
Keywords: Collisions
jets
proton–proton collisions
Issue Date: 2019
Publisher: Springer Verlag
Source: ATLAS collaboration. (2019). Search for top-quark decay t? Hq wi th 36 fb? 1 of pp colliion da ta at $$\qr t {} $$= 13 TeV wi th the ATLAS de tec tor. Journal of High Energy Physics, 2019(5), 123.
Abstract: A search for flavour-changing neutral current decays of a top quark into an up-type quark (q = u, c) and the Standard Model Higgs boson, t → Hq, is presented. The search is based on a dataset of pp collisions at s = 13 TeV recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider and corresponding to an integrated luminosity of 36.1 fb−1. Two complementary analyses are performed to search for top-quark pair events in which one top quark decays into Wb and the other top quark decays into Hq, and target the H→ bb¯ and H → τ+τ− decay modes, respectively. The high multiplicity of b-quark jets, or the presence of hadronically decaying τ-leptons, is exploited in the two analyses respectively. Multivariate techniques are used to separate the signal from the background, which is dominated by top-quark pair production. No significant excess of events above the background expectation is found, and 95% CL upper limits on the t → Hq branching ratios are derived. The combination of these searches with ATLAS searches in diphoton and multilepton final states yields observed (expected) 95% CL upper limits on the t → Hc and t → Hu branching ratios of 1.1 × 10−3 (8.3 × 10−4) and 1.2 × 10−3 (8.3 × 10−4), respectively. The corresponding combined observed (expected) upper limits on the |λtcH| and |λtuH| couplings are 0.064 (0.055) and 0.066 (0.055), respectively.[Figure not available: see fulltext.] © 2019, The Author(s).
URI: https://link.springer.com/article/10.1007%2FJHEP05%282019%29123
https://hdl.handle.net/20.500.11851/3130
ISSN: 1126-6708
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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