Measurement of weak meson form factors in spacelike regions

With the construction of high energy, high intensity accelerators (NAL & CERN, SPS) investigation of neutrino scattering on virtual pions, á la Chew-Low, becomes experimentally possible. We propose to analyse the process ν + N → μ^? + K + Δ to extract the usual K_?3 form factor(s) for spacelike momentum transfer. A model calculation suggests that f₊(T) can be determined reasonably well from a triple differential cross section, whereas only rough information on f_?(T) may be obtained from the transverse polarization of the muon. The experiment proposed requires scanning of several millions of bubble chamber pictures.