SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 136: Higgs TH, VH

T 136.3: Vortrag

Donnerstag, 23. März 2023, 18:00–18:15, HSZ/0204

Associated production of a Higgs boson and a single top quark from t-channel production (tHq) in channels with hadronically decaying tau leptons at ATLAS — •Florian Kirfel, Tanja Holm, Christian Kirfel, and Oleh Kivernyk for the ATLAS collaboration — Physikalisches Institut der Universität Bonn, Deutschland

A measurement of the single top-quark production in association with a Higgs boson and a spectator light-quark (tHq) gives insight into the properties of not only the top quark but also the Higgs boson. The associated production is uniquely sensitive to the relative sign of the top quark-Higgs boson Yukawa coupling. In this talk the ditau decay of the Higgs boson, with one hadronically and one leptonically decaying tau, is investigated. The channel where the lepton from the top quark and the one from the Higgs boson have the same sign reduces the number of background events substantially. Techniques to treat the tau fakes as well as charge flip events present in this channel will be discussed in combination with applied TMVA methods and the fitting procedure.