Dortmund 2021 – scientific programme
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T: Fachverband Teilchenphysik
T 53: Electroweak Interactions I
T 53.9: Talk
Wednesday, March 17, 2021, 18:00–18:15, Tc
Determination of angular coefficients of the Z boson production at ATLAS — •Julian Fischer 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 and thus 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 allow to probe in detail QCD contributions in Z production processes. Two of the coefficients can also be used to make inferences about the 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 and uncertainties are discussed and insights into the expected precision of the measurement will be shown.