Erlangen 2026 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 34: Fundamental Symmetries I

HK 34.1: Group Report

Thursday, March 19, 2026, 13:45–14:15, AM 00.021

The P2 experiment at MESA — Sebastian Baunack¹, Maarten Boonekamp⁴, Boris Gläser¹, Shruti Gudla¹, Jayanta Naik¹, Rahima Krini¹, Frank Maas^1,2,3, Moran Neher¹, Tobias Rimke¹, Paul Schöner², Siddharth Thakker¹, and •Malte Wilfert¹ — 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 is being set up at the MESA accelerator in Mainz. In this talk, the motivation and challenges for this measurement will be discussed together with the current status of the construction of the P2 experiment.

Keywords: P2; MESA; Parity violation; Weak mixing angle; Standard model test