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 μ pair and a neutrino (or antineutrino). Then the ratio of the respective mean laboratory energies for the μ^- and μ⁺ lies between 0.48 and 2.10.
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Pais et al. (1975) studied this question.
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