Parity-violating electron scattering at the MAMI facility in Mainz - The strangeness contribution to the form factors of the nucleon

We report here on a new measurement of the parity-violating (PV) asymmetry in the scattering of polarized electrons on unpolarized protons performed at the MAMI accelerator facility,in Mainz. This experiment is the first to use counting techniques in a parity violation experiment. The kinematics of the experiment is complementaxy to the earlier measurements of the SAMPLE Collaboration at the MIT-Bates accelerator and the HAPPEX Collaboration at Jefferson Lab. After discussing the experimental context of the experiments, the setup at MAMI and preliminary results are presented.