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  Search for top-quark decays $t \rightarrow Hq$ with 36 fb$^{-1}$ of $pp$ collision data at $\sqrt{s}=13$ TeV with the ATLAS detector

ATLAS Collaboration (2019). Search for top-quark decays $t \rightarrow Hq$ with 36 fb$^{-1}$ of $pp$ collision data at $\sqrt{s}=13$ TeV with the ATLAS detector. Journal of High Energy Physics, 05, 123. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2018-310.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-D7A3-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-D7A4-F
Genre: Journal Article

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ATLAS Collaboration1, Author
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1Max Planck Institute for Physics, Max Planck Society and Cooperation Partners, ou_2253650              

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Free keywords: ATLAS
 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, $t\rightarrow Hq$, is presented. The search is based on a dataset of $pp$ collisions at $\sqrt{s}=13$ TeV recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider and corresponds to an integrated luminosity of 36.1 fb$^{-1}$. Two complementary analyses are performed that 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 $H\rightarrow b\bar{b}$ and $H\rightarrowτ^+τ^-$ decay modes, respectively. The high multiplicity of $b$-quark jets, or the presence of hadronically decaying $τ$-leptons, are 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 $t\rightarrow Hq$ 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 $t\rightarrow Hc$ and $t\rightarrow Hu$ branching ratios of $1.1 \times 10^{-3}$ ($8.3 \times 10^{-4}$) and $1.2 \times 10^{-3}$ ($8.3 \times 10^{-4}$), 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.

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 Dates: 2019
 Publication Status: Published in print
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Title: Journal of High Energy Physics
  Abbreviation : JHEP
Source Genre: Journal
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Pages: - Volume / Issue: 05 Sequence Number: - Start / End Page: 123 Identifier: -