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 | Çakır, Orhan | |
| dc.contributor.author | Duran Yıldız, Hatice | |
| dc.contributor.department | Fen Fakültesi | tr_TR |
| dc.date.accessioned | 2020-03-18T16:49:27Z | |
| dc.date.available | 2020-03-18T16:49:27Z | |
| dc.date.issued | 2019 | |
| 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.[Figure not available: see fulltext.] | tr_TR |
| dc.description.index | wos | |
| dc.identifier.endpage | 67 | tr_TR |
| dc.identifier.issn/e-issn | 1029-8479 | |
| dc.identifier.issue | 5 | tr_TR |
| dc.identifier.other | 123 | tr_TR |
| dc.identifier.startpage | 01 | tr_TR |
| dc.identifier.uri | https://doi.org/10.1007/JHEP05(2019)123 | tr_TR |
| dc.identifier.uri | http://hdl.handle.net/20.500.12575/70735 | |
| dc.identifier.volume | 2019 | tr_TR |
| dc.language.iso | en | tr_TR |
| dc.relation.isversionof | 10.1007/JHEP05(2019)123 | tr_TR |
| dc.relation.publicationcategory | Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı | tr_TR |
| 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 | tr_TR |
| dc.type | Article | tr_TR |