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HK: Fachverband Physik der Hadronen und Kerne

HK 8: Fundamental Symmetries I

HK 8.4: Vortrag

Montag, 30. März 2020, 17:30–17:45, J-HS B

Investigation of helicity correlated false asymmetries at the P2 experiment — Sebastian Baunack¹, Dominik Becker¹, Kathrin Imai¹, Rahima Krini¹, Frank Maas^1,2,3, 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

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 a precision of 0.15% at a low four-momentum transfer of Q² = 4.5· 10⁻³ GeV². This precision is comparable to existing measurements at the Z pole. The experiment will be built at the future MESA accelerator in Mainz.

The achievable precision in the measurement of the parity violating asymmetry depends not only on the statistical uncertainty, it also depends on various systematic effects. One of them are helicity correlated differences in beam parameters like energy, position and angle. The false asymmetry induced by such fluctuations is described in this talk.