Speaker
Description
A study of the production of the Higgs boson in association with either a top-quark pair (tt¯H) or a single top quark (tH) in theτ-lepton-pair decay channel will be presented. The analysis relies on final states featuring fully hadronic decays of the top quarks and theτ-leptons. It employs data samples of proton--proton collisions ats√=13and 13.6 TeV recorded with the ATLAS detector at the CERN Large Hadron Collider and corresponding to integrated luminosities of 140 fb−1and 161 fb−1, respectively. The measured signal strength (μ), defined as the measured cross-section normalised to the Standard Model prediction, is μtt¯H=1.51+0.71−0.62 for tt¯H and μtH=−0.4+5.6−5.1 for tH. Additionally, thett¯Hcross-section is measured differentially in three bins of the Higgs boson transverse momentum in the simplified template cross-section framework
