Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 64: Fundamental Symmetries I
HK 64.4: Vortrag
Donnerstag, 31. März 2022, 15:00–15:15, HK-H9
The backward angle measurement at P2 — Sebastian Baunack1, Maarten Boonekamp4, Boris Gläser1, Kathrin Imai1, Rahima Krini1, Frank Maas1,2,3, 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 sin2θW 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 addition to the measurement under forward angle, a measurement under backward angle will be performed. This measurement will reduce the uncertainty on the axial form factor and the strange magnetic form factor and thus reducing the systematic uncertainty on the weak charge of the proton. The motivation and challenges for this measurement will be discussed in this talk.