Abstract

Abstract Using the ARGUS detector at the e+e− storage ring DORIS II, we have measured the semileptonic branching ratios of the D0 meson to be Br(D0 → e+veX) = (6·9±0·3±0·5)% and Br(D0 → μ+vμtX) = (6·0 ± 0·7 ± 1·2) %, and the semileptonic branching ratio of the charmed hadron mixture from e+e− annihilation around 10 GeV to be Br(c → e+veX) = (9·6 ± 0·4 ± 1·1)%.

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