Study of the leptonic decay of hyperons by means of k- stopped in hydrogen : example of $\Sigma^{-}\rightarrow\Lambda^{0}+e^{-}+\overline{\nu}$ decay discovered among the first 100 000 photographs of an experiment in which 300 000 were taken. The $\Sigma^{-}$ produced by the capture of the $K^{-}$ stopped in hydrogen in the saclay 81 cm bubble chamber decays according to the reaction $\Sigma^{-}\rightarrow \Lambda^{0}+e^{-}+\overline{\nu}$ with a ratio of $\frac{\Sigma^{-}\rightarrow \Lambda^{0}+e^{-}+\overline{\nu}}{\Sigma^{-}\rightarrow\eta +\pi^{-}}$

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