Measurement of charmless $B$ Decays to $ηK^*$ and $ηρ$

Abstract

We report branching fractions and CP asymmetries for $B \to ηK^*$ and $B \to ηρ$ decays. These results are obtained from a $414 {\rm fb}^{-1}$ data sample collected at the $Υ(4S)$ resonance, with the Belle detector at the KEKB asymmetric energy $e^+ e^-$ collider. The branching fractions, in parts per million, of $ηK^{*0}$, $ηK^{*+}$, $ηρ^0$, and $ηρ^+$ are $15.9\pm 1.2 \pm 0.9$, $19.7^{+2.0}_{-1.9} \pm 1.4$, $0.84^{+0.56}_{-0.51} \pm 0.18$, and $4.1^{+1.4}_{-1.3} \pm 0.34$, respectively. We find no evidence for CP asymmetries in these modes.