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dc.contributor.authorAaboud, M.
dc.contributor.authorRogan, Christopher
dc.contributor.authorThe ATLAS collaboration
dc.identifier.citationThe ATLAS collaboration., Aaboud, M., Aad, G. et al. Search for top-quark decays t → Hq with 36 fb−1 of pp collision data at √𝑠 = 13 TeV with the ATLAS detector. J. High Energ. Phys. 2019, 123 (2019).
dc.descriptionThis work is licensed under a Creative Commons Attribution 4.0 International License.en_US
dc.description.abstractA 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.en_US
dc.publisherSpringer Verlagen_US
dc.rightsCopyright CERN, for the benefit of the ATLAS Collaboration.en_US
dc.subjectHadron-Hadron scattering (experiments)en_US
dc.subjectRare decayen_US
dc.subjectTop physicsen_US
dc.titleSearch for top-quark decays t → Hq with 36 fb−1 of pp collision data at √𝑠 = 13 TeV with the ATLAS detectoren_US
kusw.kuauthorRogan, Christopher
kusw.kudepartmentPhysics and Astronomyen_US
kusw.oanotesPer Sherpa Romeo 01/15/2021:

Journal of High Energy Physics [Open panel below]Publication Information TitleJournal of High Energy Physics (JHEP) [English] ISSNs Print: 1126-6708 Electronic: 1029-8479 URL Publishers IOP Publishing [Former Publisher] Scuola Internazionale Superiore di Studi Avanzati (SISSA) [Associate Organisation] Springer Verlag [Commercial Publisher] DOAJ Listing Requires APCNo [Data provided by DOAJ] [Open panel below]Publisher Policy Open Access pathways permitted by this journal's policy are listed below by article version. Click on a pathway for a more detailed view.

Published Version NoneCC BY Institutional Repository, Subject Repository, arXiv, +1 OA PublishingThis pathway includes Open Access publishing EmbargoNo Embargo LicenceCC BY 4 Copyright OwnerAuthors Location Institutional Repository Named Repository (arXiv) Subject Repository Journal Website ConditionsPublished source must be acknowledged
kusw.oaversionScholarly/refereed, publisher versionen_US
kusw.oapolicyThis item meets KU Open Access policy criteria.en_US

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Copyright CERN, for the benefit of the ATLAS Collaboration.
Except where otherwise noted, this item's license is described as: Copyright CERN, for the benefit of the ATLAS Collaboration.