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We report measurements of the charmless semileptonic decays B0→π−/ρ−ℓ+ν and B+→π0/ρ0ℓ+ν, based on a sample of 2.75×108 BB¯ events collected at the ϒ(4S) resonance with the Belle detector at the KEKB e+e− asymmetric collider. In this analysis, the accompanying B meson is reconstructed in the semileptonic mode B→D(∗)ℓν, enabling detection of the signal modes with high purity. We measure the branching...
We present spectra of prompt electrons from decays of neutral and charged B mesons. The results are based on 140 fb −1 of data collected by the Belle detector on the ϒ(4S) resonance at the KEKB e+e− asymmetric collider. We tag ϒ(4S)→BB¯ events by reconstructing a B meson in one of several hadronic decay modes; the semileptonic decay of the other B meson is inferred from the presence of an...
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