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We report on recent measurements of the branching fractions (BFs) for thedecay channels B^0 -> {\pi}^-\l^+{\nu}, B^+ -> {\pi}^0\l^+{\nu}, B^+ ->{\eta}\l^+{\nu}, B^+ -> {\eta}'\l^+{\nu}, B^0 -> {\rho}^-\l^+{\nu} and B^+ ->{\rho}^0\l^+{\nu}. We obtain very precise values of the total branchingfractions for these decays, as well as partial branching fractions as afunction of q^2 for the decay channels B^0 -> {\pi}^-\l^+{\nu}, B^+ ->{\eta}\l^+{\nu} and B^0 -> {\rho}^-\l^+{\nu}. In particular, we use the partialbranching fractions of the B^0 -> {\pi}^-\l^+{\nu} decay channel andform-factor calculations to extract several values of |V_{ub}|. When wecompared these values of |V_{ub}| to the one measured in inclusive semileptonicB decay, we find that two of them are consistent, within large theoreticaluncertainties.

Studies of exclusive charmless semileptonique B decays and extraction of |V_{ub}| at BABAR