“…To analyse the case of pions decaying in flight with higher momenta, we calculated the kinematic parameters of the π→µν µ decay for a pion momen- Table 2. tum of 200 MeV/c and neutrino mass of 0.300 keV. This value of the pion momentum has been choosen because, at the JINR Phasotron, the DUBTO experiment [13] studying pion interactions with 4 He nuclei at 200 MeV/c, collected several π→µν µ events. In this case the allowed values of the φ angle are less than 11 deg.…”