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HK: Fachverband Physik der Hadronen und Kerne

HK 13: Fundamental Symmetries I

HK 13.3: Gruppenbericht

Montag, 18. März 2019, 17:30–18:00, HS 16

The P2 experiment: A high precision measurement of the weak mixing angle — Sebastian Baunack¹, Dominik Becker¹, Frank Maas^1,2,3, David Rodriguez Pineiro², and •Malte Wilfert¹ for the P2 collaboration — ¹Institut für Kernphysik, Johannes Gutenberg-Universität Mainz — ²Helmholtz-Institut Mainz, Johannes Gutenberg-Universität Mainz — ³PRISMA Cluster of Excellence, Johannes Gutenberg-Universität Mainz

The weak mixing angle sin²θ_w can be measured in parity violating elastic electron-proton scattering. The aim of the P2 experiment is a very precise measurement of the weak mixing angle with a precision of 0.15% at a low four-momentum transfer of Q² = 4.5· 10⁻³ GeV². This precision is comparable to existing measurements at the Z pole. The experiment will be built at the future MESA accelerator in Mainz.

In this talk, the motivation for the measurement and the theoretical and experimental challenges will be discussed.