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Hokuue (for the Belle Collaboration)","submitted_at":"2006-04-12T06:06:35Z","abstract_excerpt":"We report measurements of the charmless semileptonic decays $B^0 \\to \\pi^- / \\rho^- \\ell^{+} \\nu$ and $B^+ \\to \\pi^0 / \\rho^0 \\ell^{+} \\nu$, based on a sample of $2.75 \\times 10^8$ $B \\bar{B}$ events collected at the $\\Upsilon(4S)$ 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 $B \\to D^{(*)} \\ell \\nu$, enabling detection of the signal modes with high purity. 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