Measurements of the Branching Fraction and Polarization in ${B}^{+}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{+}{K}^{*0}$ Decays

Measurements of the Branching Fraction and Polarization in $B^{+} \to ρ^{+} K^{* 0}$ Decays

J. Zhang et al. (Belle Collaboration)

Phys. Rev. Lett. 95, 141801 – Published 28 September 2005

Abstract

We present the results of a study of the charmless vector-vector decay $B^{+} \to ρ^{+} K^{* 0}$ , based on $253 {fb}^{- 1}$ of data collected with the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider. We obtain the branching fraction $B (B^{+} \to ρ^{+} K^{* 0}) = [8.9 \pm 1.7 (stat) \pm 1.2 (syst)] \times 10^{- 6}$ . We also perform a helicity analysis of the $ρ$ and $K^{*}$ vector mesons, and obtain the longitudinal polarization fraction $f_{L} (B^{+} \to ρ^{+} K^{* 0}) = 0.43 \pm 0.11 (stat)_{- 0.02}^{+ 0.05} (syst)$ .