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Belle Collaboration,Hokuue, T.,Abe, K.,Abe, K.,Adachi, I.,Aihara, H.,Asano, Y.,Aushev, T.,Bakich, A.M.,Balagura, V.,Barberio, E.,Barbero, M.,Bay, A.,Bedny, I.,Belous, K.,Bitenc, U.,Bizjak, I.,Blyth, S North-Holland Pub. Co 2007 Physics letters: B Vol.648 No.2
We report measurements of the charmless semileptonic decays B<SUP>0</SUP>->π<SUP>-</SUP>/ρ<SUP>-</SUP>@?<SUP>+</SUP>ν and B<SUP>+</SUP>->π<SUP>0</SUP>/ρ<SUP>0</SUP>@?<SUP>+</SUP>ν, based on a sample of 2.75x10<SUP>8</SUP>BB@? events collected at the @?(4S) resonance with the Belle detector at the KEKB e<SUP>+</SUP>e<SUP>-</SUP> asymmetric collider. In this analysis, the accompanying B meson is reconstructed in the semileptonic mode B->D<SUP>(*)</SUP>@?ν, enabling detection of the signal modes with high purity. We measure the branching fractions B(B<SUP>0</SUP>->π<SUP>-</SUP>@?<SUP>+</SUP>ν)=(1.38+/-0.19+/-0.14+/-0.03)x10<SUP>-4</SUP>, B(B<SUP>0</SUP>->ρ<SUP>-</SUP>@?<SUP>+</SUP>ν)=(2.17+/-0.54+/-0.31+/-0.08)x10<SUP>-4</SUP>, B(B<SUP>+</SUP>->π<SUP>0</SUP>@?<SUP>+</SUP>ν)=(0.77+/-0.14+/-0.08+/-0.00)x10<SUP>-4</SUP> and B(B<SUP>+</SUP>->ρ<SUP>0</SUP>@?<SUP>+</SUP>ν)=(1.33+/-0.23+/-0.17+/-0.05)x10<SUP>-4</SUP>, where the errors are statistical, experimental systematic, and systematic due to form factor uncertainties, respectively. For each mode we also present the partial branching fractions in three q<SUP>2</SUP> intervals: q<SUP>2</SUP><8, 8=<q<SUP>2</SUP><16, and q<SUP>2</SUP>>=16 GeV<SUP>2</SUP>/c<SUP>2</SUP>. From our partial branching fractions for B->π@?ν and recent results for the form factor from unquenched Lattice QCD calculations, we obtain values of the CKM matrix element |V<SUB>ub</SUB>|.