Bonn 2020 – scientific programme
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T: Fachverband Teilchenphysik
T 21: Electroweak physics I
T 21.1: Talk
Monday, March 30, 2020, 16:30–16:45, L-3.016
Determination of the weak mixing angle using angular coefficients of Z boson production at ATLAS — •Julian Fischer and Stefan Tapprogge — Institut für Physik, Johannes Gutenberg-Universität, Mainz
The weak mixing angle θW is one of the fundamental parameters in the electroweak sector of the Standard Model. A measurement of this parameter serves as a fundamental test of this theory and could thus also provide a gateway to physics beyond the Standard Model. Different approaches can be taken to determine this parameter experimentally. In this contribution the focus is on the extraction of the weak mixing angle using 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’. Recent results from ATLAS are reviewed and strategies for a full Run 2 measurement using an integrated luminosity of L≈ 147 fb−1 at √s=13 TeV are discussed. Expectations on the accuracy will be formulated and challenges will be addressed based on the experience from the 8 TeV measurement.