15th Conference on the Intersections of Particle and Nuclear Physics (CIPANP 2025) Madison Wisconsin June 9-13

A high precision determination of the weak mixing angle at low momentum transfer - The P2 experiment

Jun 12, 2025, 2:50 PM

25m

Beefeaters

Parallel session presentation Precision Physics at High Intensities Joint PPHI, Symmetries/EW,. PGDNN

Speaker

Caryn Palatchi (Indiana University)

Description

The P2 experiment aims for a new determination of the weak mixing angle at a very low momentum transfer. This parity violating electron scattering experiment will be carried out at the new electron accelerator MESA in Mainz, Germany. The parity violating asymmetry of the elastic scattering of polarized electrons off of protons in a liquid hydrogen unpolarized target is of order 20 parts per billion. The relative target accuracy is comparable to the most precise existing measurements at the Z-pole. This extraordinarily high precision measurement is sensitive to mass scales up to 50 TeV and will search for new beyond the standard model physics.