Model-independent analysis of the weak interaction in e− -N elastic scattering experiments

We discuss what model-independent information about the parity non-conserving electron-quark neutral current interaction can be obtained in the experiments on elastic scattering of longitudinally polarized electrons on unpolarized nucleons. Two possible forms of the neutron electric form factor G_E^γn(q²) are used in our analysis. The interpretation of the P-odd asymmetry, measured in these experiments, in terms of electron-quark neutral current coupling constants depends on the form chosen for G_E^γn(q²). We note also that the polarized e^?-p elastic scattering experiments might be used in principle to study the q² dependence of G_E^γn(q²).