SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 51: Fundamental Symmetries III

HK 51.2: Gruppenbericht

Mittwoch, 22. März 2023, 18:00–18:30, SCH/A252

The P2 experiment — Sebastian Baunack¹, Maarten Boonekamp⁴, Boris Gläser¹, 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 — ⁴IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France

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 an accuracy of 0.15% at a low four-momentum transfer of Q² = 4.5· 10⁻³ GeV². In combination with existing measurements at the Z pole with comparable accuracy, this comprises a test of the standard model with a sensitivity towards new physics up to a mass scale of 50 TeV. The experiment will be built at the future MESA accelerator in Mainz. In this talk, the motivation and challenges for this measurement will be discussed together with ideas for measurements at lower beam energies, which will be available at the start of MESA.