Abstract
Using the ARGUS detector at the e +e − storage ring DORIS II at DESY we have investigated the decays B 0→ D ∗−e +v and B 0→D ∗−μ +ν. The B 0 mesons were produced in 39600 ϒ(4 S)→ B 0 B 0 decays. Assuming electron-muon universality we obtain a branching ratio BR( B 0→ D ∗−e +v)= BR( B 0→ D ∗−γm +ν)=(7.0±1.2±1.9)% .
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