Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 34: Top Quarks: Properties -2

T 34.6: Vortrag

Dienstag, 22. März 2022, 17:30–17:45, T-H19

Studies for the measurement of the production of top-quark pairs in association with a Z boson decaying to a pair of tau leptons with the ATLAS detector — •Simon Neuhaus and Thomas Dado — TU Dortmund University, Department of Physics

A Study of the associated production of a top-quark pair and a Z boson decaying into a tau-lepton pair is presented. This process allows to test the lepton-universality prediction of the Standard Model of particle physics in the top-quark-sector. Additionally, this process is sensitive to various BSM couplings between the top quarks and tau-leptons. Because only the visible mass of the di-tau system is reconstructable, a significant contribution from the off-shell events is expected in the signal region.

The measurement targets decays with one or two light leptons, at least three jets and two hadronically decaying tau leptons. Some of the important background processes include the diboson (ZZ, WZ, WW) processes and processes with misreconstructed tau leptons. Initial studies on the optimization of the event selection using the Monte Carlo simulations for the ATLAS data of the complete LHC Run 2 will be shown. Observables that are interesting for the optimisation of the selection include: the transverse momentum of all three or four leptons, the number of jets and the number of b-tagged jets.