In:
Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2019, No. 5 ( 2019-05)
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 $$ \sqrt{s} $$ 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 $$ H\to b\overline{b} $$ H → b b ¯ 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.
Type of Medium:
Online Resource
ISSN:
1029-8479
DOI:
10.1007/JHEP05(2019)123
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2019
detail.hit.zdb_id:
2027350-2
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