Studies of exclusive charmless semileptonique B decays and extraction of |V_{ub}| at BABAR
We report on recent measurements of the branching fractions (BFs) for the decay channels B^0 -> π^-ł^+ν, B^+ -> π^0ł^+ν, B^+ -> ηł^+ν, B^+ -> η'ł^+ν, B^0 -> ρ^-ł^+ν and B^+ -> ρ^0ł^+ν. We obtain very precise values of the total branching fractions for these decays, as well as partial branching fractions as a function of q^2 for the decay channels B^0 -> π^-ł^+ν, B^+ -> ηł^+ν and B^0 -> ρ^-ł^+ν. In particular, we use the partial branching fractions of the B^0 -> π^-ł^+ν decay channel and form-factor calculations to extract several values of |V_{ub}|. When we compared these values of |V_{ub}| to the one measured in inclusive semileptonic B decay, we find that two of them are consistent, within large theoretical uncertainties.
hep-ex↗