Six-fermion interaction and neutral currents

The constant of six-fermion interaction of the neutral lepton current with two charged hadron currents is estimated, using the experimental data on the reaction ν+n → +p+π at the threshold. It is shown that the cross-section of the reaction ν+N → +N+π must be very large at high energies. The relative value of the six-fermion interaction term of the π-meson electroproduction cross-section increases with the particle energy. W-boson production cross-sections at e+e- and νN-collisions are estimated as well