Abstract
B mesons have been reconstructed in five decay channels of the type B→D ∗±nπ(n=1,2,3) using data accumulated by the ARGUS experiment at the e +e − storage ring DORIS II at DESY. In total, we find 40 neutral B mesons above a background of 15±6 events with a mass of (5278.2±1.0±3.0) MeV/ c 2 and 32 charged B mesons above a background of 17±6 events with a mass of (5275.8±1.3±3.0) MeV/ c 2. The decays B 0 D ∗+π −π 0 , B 0 D ∗+π −π −π + , and B −→ D ∗+π −π −π 0 have been observed for the first time. We find substantially smaller branching ratios for the decay modes B 0→ D ∗+π − and B −→ D ∗+π −π − than previously published by the CLEO collaboration.
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