Parity violation in ep and ed scattering: The G0 experiment

Parity-violating asymmetries in electron scattering result from the interference of photon- and Z0-exchange. In the 70' and 80', they have been used to measure sin2 θW and to test the Standard Model (SM). Now one can use Parity-Violation to study the inner structure of the target, and in particular its strangeness content. Experiments measuring combinations of the strange electric, magnetic and axial form-factors at various momentum transfers Q2 have been recently done or are under way. We discuss the existing results and describe the G0 experiment at Jefferson Lab which aims at determining separately these three form-factors in the momentum range Q2=0.12 to 1.0 (GeV/c)2 by doing a Rosenbluth separation on a proton target complemented by backward quasi-elastic measurements on deuterium at similar Q2 values