The main objective of project P2 is the extraction of a precise value of the weak mixing angle, \(\sin^2 \theta_W\), from a measurement of the parity violating (PV) asymmetry in elastic electron proton scattering, with an accuracy comparable to that of the existing LEP measurements of \( \Delta \sin^2 \theta_W = 0.00037\) corresponding to a 0.16% relative uncertainty.

Design and construction of an integrating spectrometer for the measurement of the parity violating asymmetry in elastic electron-proton scattering based on integrating readout of quartz Cherenkov detectors, including a tracking system for the measurement of the average momentum transfer \(Q^2\)based on thin silicon pixel detectors, see the figure on the right.

Realisation of high precision polarimetry for electron beams.

Calculation of electroweak radiative corrections and nuclear form factor effects for the measurement of the weak charge of the proton.

Commissioning of the P2 spectrometer, including the MESA control systems for parity violating electron scattering.