The existence of a massless Goldstone boson coupling to neutrinos in theories with spontaneous violation of a global B-L symmetry may be consequential in precision measurements of the parameters in muon decay. We calculate the decay parameters for μ→eMM, where the Majoron M is the Goldstone boson, and discuss limits on the Majoron-neutrino coupling.
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Goldman et al. (1982) studied this question.
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