Mainz 2022 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 37: Instrumentation IX

HK 37.4: Vortrag

Mittwoch, 30. März 2022, 15:00–15:15, HK-H3

The front-end signal path of the P2 experiment at MESA — Sebastian Baunack¹, Boris Gläser¹, Kathrin Imai¹, •Rahima Krini¹, Frank Maas^1,2, David R. Pineiro², Tobias Rimke¹, and Malte Wilfert¹ — ¹Institute for Nuclear Physics, Mainz, Germany — ²Helmholtz Institute Mainz, Germany

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=4.5·10⁻³GeV². 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.
The small asymmetries O(10⁻⁸) and the high precision require very high statistics and therefore an integrating measurement with the associated integrating data acquisition readout chain. A joint read-out electronics for P2 experiment in Mainz and for Moeller experiment at the Jefferson Laboratory is under development in collaboration with a group of University of Manitoba. The first prototype of a full differential integrating detector signal chain was build and tested at MAMI (Mainzer Mikrotron). The results fulfill the requirements of the P2 parity violation experiment and will be presented in this talk.