Possible experimental search for the anomalous 4. nu. interaction

The process ..nu../sub ..mu../N..-->..l/sup +/..nu nu..X is analyzed in detail on the basis of the most general form of effective Lagrangian of the 4..nu.. interaction. It is shown that the study of the momentum and angle distributions of secondary leptons with ''incorrect'' sign of the charge and the use of the kinematical features of such processes can greatly increase the experimental sensitivity to the contribution of the 4..nu.. interaction and strengthen the constraints on the corresponding coupling constant.