Measurement of the Higgs Boson Production Rate in Association With Top Quarks in Final States With Electrons, Muons, And Hadronically Decaying Tau Leptons at ?s=13TeV

dc.authorid291820en_US
dc.contributor.authorGüler, Emine Gürpınar
dc.date.accessioned2021-09-09T13:09:22Z
dc.date.available2021-09-09T13:09:22Z
dc.date.issued2021
dc.departmentİstanbul Beykent Üniversitesien_US
dc.description.abstractThe rate for Higgs (H) bosons production in association with either one (tH) or two (tt¯H) top quarks is measured in final states containing multiple electrons, muons, or tau leptons decaying to hadrons and a neutrino, using proton-proton collisions recorded at a center-of-mass energy of 13 TeV by the CMS experiment. The analyzed data correspond to an integrated luminosity of 137 fb?1. The analysis is aimed at events that contain H ? WW, H ? ??, or H ? ZZ decays and each of the top quark(s) decays either to lepton+jets or all-jet channels. Sensitivity to signal is maximized by including ten signatures in the analysis, depending on the lepton multiplicity. The separation among the tH, the tt¯H, and the backgrounds is enhanced through machine-learning techniques and matrix-element methods. The measured production rates for the tt¯H and tH signals correspond to 0.92 ± 0.19 (stat) +0.17?0.13 (syst) and 5.7 ± 2.7 (stat) ± 3.0 (syst) of their respective standard model (SM) expectations. The corresponding observed (expected) significance amounts to 4.7 (5.2) standard deviations for tt¯H, and to 1.4 (0.3) for tH production. Assuming that the Higgs boson coupling to the tau lepton is equal in strength to its expectation in the SM, the coupling yt of the Higgs boson to the top quark divided by its SM expectation, ?t = yt/ySMt, is constrained to be within ?0.9 < ?t < ?0.7 or 0.7 < ?t < 1.1, at 95% confidence level. This result is the most sensitive measurement of the tt¯H production rate to date.en_US
dc.identifier.citationEur. Phys. J. C (2021) 81:378en_US
dc.identifier.doi10.1140/epjc/s10052-021-09014-x
dc.identifier.issn1748-0221
dc.identifier.pmid34727142en_US
dc.identifier.scopus2-s2.0-85105163177en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.urihttps://doi.org/10.1140/epjc/s10052-021-09014-x
dc.identifier.wosWOS:000796648200001en_US
dc.identifier.wosqualityQ2en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.indekslendigikaynakPubMeden_US
dc.language.isoenen_US
dc.publisherSpringer Verlag [Primary Co-Publisher]en_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.subjectHigh Energy Physicsen_US
dc.subjectExperiment (hep-ex)en_US
dc.titleMeasurement of the Higgs Boson Production Rate in Association With Top Quarks in Final States With Electrons, Muons, And Hadronically Decaying Tau Leptons at ?s=13TeVen_US
dc.typeArticleen_US

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