Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/123771
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DC Field | Value | Language |
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dc.contributor.author | Aaboud, M. | - |
dc.contributor.author | Aad, G. | - |
dc.contributor.author | Abbott, B. | - |
dc.contributor.author | Abbott, D.C. | - |
dc.contributor.author | Abdinov, O. | - |
dc.contributor.author | Abeloos, B. | - |
dc.contributor.author | Abhayasinghe, D.K. | - |
dc.contributor.author | Abidi, S.H. | - |
dc.contributor.author | AbouZeid, O.S. | - |
dc.contributor.author | Abraham, N.L. | - |
dc.contributor.author | Abramowicz, H. | - |
dc.contributor.author | Abreu, H. | - |
dc.contributor.author | Abulaiti, Y. | - |
dc.contributor.author | Acharya, B.S. | - |
dc.contributor.author | Adachi, S. | - |
dc.contributor.author | Adam, L. | - |
dc.contributor.author | Adamczyk, L. | - |
dc.contributor.author | Adamek, L. | - |
dc.contributor.author | Adelman, J. | - |
dc.contributor.author | Adersberger, M. | - |
dc.contributor.author | et al. | - |
dc.date.issued | 2019 | - |
dc.identifier.citation | The Journal of High Energy Physics, 2019; 2019(5):123-[1],1-123-66 | - |
dc.identifier.issn | 1126-6708 | - |
dc.identifier.issn | 1029-8479 | - |
dc.identifier.uri | http://hdl.handle.net/2440/123771 | - |
dc.description.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. | - |
dc.description.statementofresponsibility | M. Aaboud … D. Duvnjak … P. Jackson … J.L. Oliver … A. Petridis … A. Qureshi … A.S. Sharma … M.J. White … et al. [The ATLAS Collaboration] | - |
dc.language.iso | en | - |
dc.publisher | Springer Nature | - |
dc.rights | Open Access, Copyright CERN, for the benefit of the ATLAS Collaboration. Article funded by SCOAP³. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. | - |
dc.source.uri | http://dx.doi.org/10.1007/jhep05(2019)123 | - |
dc.title | Search for top-quark decays t → Hq with 36 fb⁻¹ of pp collision data at √s = 13 TeV with the ATLAS detector | - |
dc.title.alternative | Search for top-quark decays t -> Hq with 36 fb(-1) of pp collision data at root s = 13 TeV with the ATLAS detector | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1007/JHEP05(2019)123 | - |
dc.relation.grant | ARC | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Jackson, P. [0000-0002-0847-402X] | - |
dc.identifier.orcid | White, M.J. [0000-0001-5474-4580] | - |
Appears in Collections: | Aurora harvest 4 Physics publications |
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hdl_123771.pdf | Published version | 1.5 MB | Adobe PDF | View/Open |
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