Measurements of branching fractions and $q^2$ distributions for $B\to \pi \ell \nu$ and $B\to \rho \ell \nu$ Decays with $B\to D^{(\ast )}\ell \nu$ Decay Tagging

T. Hokuue

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 $2.75\times 10^8$ $B\bar{B}$ e…