Key points are not available for this paper at this time.
Suppose that a neutral, heavy, spin- lepton were created by a mixed neutrino-anti-neutrino beam incident on an arbitrary target and that this lepton subsequently decayed into a pair and a neutrino (or antineutrino). Then the ratio of the respective mean laboratory energies for the ^- and ^+ lies between 0. 48 and 2. 10.
Pais et al. (Mon,) studied this question.