Physics Colloquium, Frank Maas, Helmholtz-Institut Mainz, GSI, PRISMA+ Cluster of Exzellenz: The P2 experiment: A high precision determination of the weak mixing angle at low momentum transfer
| When: | Th 20-02-2020 16:00 - 17:00 |
| Where: | FSE-Building 5111.0080 |
| Speaker: | Frank Maas | |
| Affiliation: | Helmholtz-Institut Mainz, GSI, PRISMA+ Cluster of Exzellenz | |
| Title: |
The P2 experiment: |
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| Date: | 20 February 2020 | |
| Start: | 16:00 (Doors open and coffee available at 15:30) | |
| Location: | FSE-Building 5111.0080 | |
| Host: | Johan Messchendorp |
Abstract:
The P2 experiment aims for a new determination of the weak mixing angle sin^2 θ_W at a very low momentum transfer. The relative target accuracy in the weak mixing angle is 0.15% which is comparable to the existing most precise measurements at the Z pole.
The experimental method is electron scattering off a liquid hydrogen target. The parity violating asymmetry in the cross section of the elastic scattering of polarized electrons off unpolarized hydrogen is of order 20 parts per billion (2 x 10-8). This measurement will be carried out at the new electron accelerator MESA in Mainz, Germany. This indirect search for new physics beyond the standard model is sensitive for a mass scale up to 50 TeV.