The rate of the decay K⁺→μ⁺μ⁺π^- is computed in a relativistic quark model for the mesons. This double-beta decay is assumed to be induced by a light Majorana neutrino mass m_ν. The rate for this mode is 7 ×{} 10^-19{sec}^{{-}1}$, for ${m}_{{ν}}{~}1$ keV.
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Abad et al. (1984) studied this question.
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