The G0 experiment at Jefferson Laboratory: The nucleon strangeness form factors

The G0 experiment is dedicated to the determination of the strange quark's contribution to the electric and magnetic nucleon form factors, provided by parity-violating asymmetries of cross-sections measured with longitudinaly polarized electrons in elastic electron-proton scattering and quasi-elastic electron-deuteron scattering. Forward angle measurements, which have been performed in Hall C of Jefferson Laboratory, have provided a linear combination of electric and magnetic vector form factors for momentum transfers in the range 0.1 to 1 (GeV/c)2. Backward angle measurements, which will be performed starting in 2006, will allow the complete separation of the form factors at Q2 of 0.23 and 0.63 (GeV/c)2.