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We report on a study of B0→D(∗)0π+π− decays using 29.1 fb −1 of e + e − annihilation data recorded at the ϒ(4S) resonance with the Belle detector at the KEKB storage ring. Making no assumptions about the intermediate mechanism, the branching fractions for B0→D0π+π− and B0→D∗0π+π− are determined to be (8.0±0.6±1.5)×10 −4 and (6.2±1.2±1.8)×10 −4 , respectively...
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