Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 5: Electroweak Interactions (Exp.) 1

T 5.6: Vortrag

Montag, 21. März 2022, 17:35–17:50, T-H18

Measurement of angular coefficients of the Z boson production at ATLAS — •Julian Blumenthal and Stefan Tapprogge — Institut für Physik, Johannes Gutenberg-Universität, Mainz

A better understanding of QCD production processes at hadron colliders is a key aspect for theoretical predictions of perturbative QCD at higher accuracy. It allows for more precise measurements of Standard Model parameters and background estimations for searches. This contribution focusses on the measurement of angular coefficients that are used to describe the differential cross section of the Z boson production and subsequent decay into leptons in the Collins-Soper-frame. These angular coefficients can be used to probe QCD contributions in Z production processes in detail. Two of the coefficients in particular can also be used to make inferences about the effective weak mixing angle. For the measurement the full Run 2 ATLAS dataset with an integrated luminosity of L ≈ 139 fb⁻¹ at √s =13 TeV is used, which increases the statistical accuracy significantly at a higher centre-of-mass energy than previous analyses. Major challenges of the measurement using centrally produced charged lepton pairs will be described and expected uncertainties discussed.