Study of the q2 dependence of B and of B() and extraction of
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We report on determinations of |Vub| resulting from studies of the branching fraction and q2 distributions in exclusive semileptonic B decays that proceed via the bu transition. Our data set consists of the 9.7106 BB meson pairs collected at the Y(4S) resonance with the CLEO II detector. We measure B(B0 -+)=(1.330.180.11 0.010.07)10-4 and B(B0 -+)=(2.170.34-0.54+0.470.41 0.01)10-4, where the errors are statistical, experimental systematic, systematic due to residual form-factor uncertainties in the signal, and systematic due to residual form-factor uncertainties in the cross-feed modes, respectively. We also find B(B++)=(0.840.31 0.160.09)10-4, consistent with what is expected from the B mode and quark model symmetries. We extract |V ub| using light-cone sum rules for 0q2<16GeV 2 and lattice QCD for 16 GeV2q2