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Search for top-quark decays t → Hq with 36 fb−1 of pp collision data at √s = 13 TeV with the ATLAS detector
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Search for top-quark decays t → Hq with 36 fb−1 of pp collision data at √s = 13 TeV with the ATLAS detector

M. Aaboud, K. Cheung, G. Aad, P.J. Hsu, B. Abbott, D.C. Abbott, O. Abdinov, B. Abeloos, D.K. Abhayasinghe, S.H. Abidi, …
Journal of High Energy Physics, 卷.2019(5), 123
05/2019
DOI: https://doi.org/10.1007/JHEP05(2019)123
Web of Science ID: WOS:000468948900001

摘要

Hadron-Hadron scattering (experiments) Rare decay Top physics Nuclear and High Energy Physics
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 |λ tcH | and |λ tuH | couplings are 0.064 (0.055) and 0.066 (0.055), respectively.[Figure not available: see fulltext.]

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引用書目主題
5 Physics
5.9 Particles & Fields
5.9.19 Beyond Standard Model
Web Of Science研究領域
Physics, Particles & Fields
ESI研究領域
Physics

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