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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
dc.contributor.author | Aaboud, M. | |
dc.contributor.author | Rogan, Christopher | |
dc.contributor.author | The ATLAS collaboration | |
dc.date.accessioned | 2021-01-15T20:57:46Z | |
dc.date.available | 2021-01-15T20:57:46Z | |
dc.date.issued | 2019-05-21 | |
dc.identifier.citation | The 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). https://doi.org/10.1007/JHEP05(2019)123 | en_US |
dc.identifier.uri | http://hdl.handle.net/1808/31163 | |
dc.description | This work is licensed under a Creative Commons Attribution 4.0 International License. | en_US |
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. | en_US |
dc.publisher | Springer Verlag | en_US |
dc.rights | Copyright CERN, for the benefit of the ATLAS Collaboration. | en_US |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | en_US |
dc.subject | Hadron-Hadron scattering (experiments) | en_US |
dc.subject | Rare decay | en_US |
dc.subject | Top physics | en_US |
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 | en_US |
dc.type | Article | en_US |
kusw.kuauthor | Rogan, Christopher | |
kusw.kudepartment | Physics and Astronomy | en_US |
dc.identifier.doi | 10.1007/JHEP05(2019)123 | en_US |
kusw.oaversion | Scholarly/refereed, publisher version | en_US |
kusw.oapolicy | This item meets KU Open Access policy criteria. | en_US |
dc.rights.accessrights | openAccess | en_US |