我们研究了五体衰变μ−→e−e+e−νμνee$${\mu}^{-}\to{e}^{-}{e}^{+}{e}^{-}{\nu}_{\mu}{\overline{\nu}}_e$$和τ-→ℓ-ℓ'+ℓ'-ντν¯ℓ$${\tau}^{-}\to\{\ell}^{-}{\ell}^{\prime+}{\ell}^{\prime-}{\nu}_{\tau}{\overline{\nu}}__{\ell}$$在标准模型（SM）中以及在一般有效场论中对ℓ，ℓ'