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HK: Fachverband Physik der Hadronen und Kerne

HK 20: Fundamental Symmetries

HK 20.2: Group Report

Wednesday, September 1, 2021, 17:00–17:30, H4

Parity violating electron carbon scattering at the P2 experiment — Sebastian Baunack¹, Kathrin Imai¹, Rahima Krini¹, Frank Maas^1,2,3, Tobias Rimke¹, 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 addition to the measurement using a liquid hydrogen target, the possibility of other targets for measuring the parity violating elastic electron scattering are considered. The motivation and challenges for a measurement using a solid carbon target will be discussed in this talk.