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A new measurement of the parity violating asymmetry in elastic electronscattering on hydrogen at backward angles and at a four momentum transfer ofQ^2=0.22 (GeV/c)^2 is reported here. The measured asymmetry is A_LR=(-17.23 +-0.82_stat +-0.89_syst) ppm. The Standard Model prediction assuming nostrangeness is A_0=(-15.87 +- 1.22) ppm. In combination with previous resultsfrom measurements at forward angles, it it possible to disentangle for thefirst time the strange electric and magnetic form factors at this momentumtransfer, G_E^s(0.22)=0.050 +- 0.038 +- 0.019 and G_M^s(0.22)=-0.14 +- 0.11 +-0.11.

Measurement of Strange Quark Contributions to the Vector Form Factors of the Proton at Q**2=0.22 (GeV/c)**2

Measurement of Strange Quark Contributions to the Vector Form Factors of the Proton at Q2=0.22 (GeV/c)2