Darmstadt 2016 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HK: Fachverband Physik der Hadronen und Kerne

HK 45: Postersession

HK 45.54: Poster

Mittwoch, 16. März 2016, 18:30–20:30, S1/05 22-24

P2 - A fused silica Cherenkov detector for the high precision determination of the weak mixing angle — •Kathrin Gerz¹, Dominik Becker¹, Thomas Jennewein¹, Sebastian Baunack¹, Krishna Kumar³, and Frank Maas^1,2 — ¹Johannes Gutenberg Universität Mainz — ²Helmholtz Institut Mainz — ³Department of Physics and Astronomy, Stony Brook University, Stony Brook, USA

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 0.15%. Since the weak charge of the proton is small compared to its electric charge, the measurable asymmetry is in the order of only 30ppb, requiring a challenging measurement to a precision of only 0.5ppb or below. In order to achieve this precision we need to collect very high statistics and carefully minimize interfering effects like apparatus induced false asymmetries.

We present the status of the development of an integrating fused-silica Cherenkov detector 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 background particles both by simulations and by beam tests at the MAMI accelerator.