Bochum 2018 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 52: Poster
HK 52.66: Poster
Donnerstag, 1. März 2018, 16:30–18:45, Audimax Foyer
P2 - A fused silica Cherenkov detector for the high precision determination of the weak mixing angle — •Kathrin Imai1, Dominik Becker1, David Rodriguez2, Sebastian Baunack1, Michael Gericke3, and Frank Maas1,2 — 1Institut für Kernphysik, Johannes Gutenberg-Universität Mainz — 2Helmholtz-Institut Mainz — 3University of Manitoba, Canada
The weak mixing angle is a central parameter of the standard model and its high precision determination is tantamount to probing for new physics effects.
The P2 experiment at the MESA accelerator in Mainz will perform such a measurement of the weak mixing angle via parity violating electron-proton scattering. We aim to determine sin2 (Θ_W) to a relative precision of 0.13%. Since the weak charge of the proton is small compared to its electric charge, the measurable asymmetry is only 33ppb, requiring a challenging measurement to a precision of only 0.44ppb. In order to achieve this precision we need to collect very high statistics and carefully minimize perturbing effects like apparatus induced false asymmetries.
We present the status of the development of an integrating fused- silica Cherenkov detector, which is suitable for a high precision and high intensity experiment like P2. The contribution will focus on the investigation of the detector's response to incoming signal and back- ground particles determined by both MC simulations and by measure- ments at the MAMI facility in Mainz.