Strange Form Factors in Neutrino Scattering

The determination of the strange quark contribution to the nucleonic axial and vector weak currents has raised large and continuous interest in theoretical and experimental physics, especially after the measurements of the polarised structure function g 1 of the proton, which indicated a non–zero contribution of the strange quark to the proton spin. In recent years, intermediate energy physics has been mainly focused on parity violating electron scattering and on the strange vector current, while the strange contribution to the nucleon axial current has been widely investigated only at higher energies. The measurement of the structure function g 1(x) in polarised deep inelastic scattering can be used to determine the one nucleon matrix elements of the axial quark current 1 〈p, s|qγγq|p, s〉 = 2Msαg A . (1)