Results from the Mainz A4 experiment Backward angle measurements at Q 2 = 0.22 GeV 2

The A4 collaboration at the MAMI accelerator at Mainz investigates the contribution of strange quarks to the form factors of the nucleon by measuring the parity violating asymmetry APV in the cross section of elastic scattering of longitu- dinally polarized electrons off hydrogen and deuterium. Recently, measurements at backward angles at a four momentum transfer of Q 2 = 0.22 GeV 2 were completed. Together with previous results at forward angles at the same momentum transfer, the strange electric and magnetic form factors G s and G s can be disentangled.