Measurement of branching fractions of $B$-meson decays to final states containing an $\eta^\prime$ and a vector meson

We present branching fraction results for charged and neutral $B$ decay modes to charmless, quasi-two body, final states containing $\eta^\prime K^*$ and $\eta^\prime \rho$. The results are compared to theoretical predictions and provide information on the suppressed magnitude of $\eta^\prime K^*$ with respect to enhanced $\eta^\prime K^*$ decay channel. The results are derived using a multivariate maximum likelihood fit using data recorded by the BaBar detector, which comprise an integrated luminosity of $210.5~{\rm fb}^{-1}$ corresponding to 232 million $B\bar {B}$ pairs.