Measurement of charmlessBdecays toηK*andηρ

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Abstract

We report measurements of branching fractions and $CP$ asymmetries for $B\ensuremath{\rightarrow}\ensuremath{\eta}{K}^{*}$ and $B\ensuremath{\rightarrow}\ensuremath{\eta}\ensuremath{\rho}$ decays. These results are obtained from a $414\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. We measure the following branching fractions: $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}\ensuremath{\eta}{K}^{*0})=(15.2\ifmmode\pm\else\textpm\fi{}1.2\ifmmode\pm\else\textpm\fi{}1.0)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ and $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}\ensuremath{\eta}{K}^{*+})=({19.3}_{\ensuremath{-}1.9}^{+2.0}\ifmmode\pm\else\textpm\fi{}1.5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, where the first error is statistical and the second systematic. We also find a $2.7\ensuremath{\sigma}$ excess in the ${B}^{+}\ensuremath{\rightarrow}\ensuremath{\eta}{\ensuremath{\rho}}^{+}$ mode and measure $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}\ensuremath{\eta}{\ensuremath{\rho}}^{+})=({4.1}_{\ensuremath{-}1.3}^{+1.4}\ifmmode\pm\else\textpm\fi{}0.4)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}<6.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ at 90% confidence level. For ${B}^{0}\ensuremath{\rightarrow}\ensuremath{\eta}{\ensuremath{\rho}}^{0}$ decays, we determine the upper limit $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}\ensuremath{\eta}{\ensuremath{\rho}}^{0})<1.9\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ at 90% confidence level. The partial rate asymmetries are ${\mathcal{A}}_{CP}(\ensuremath{\eta}{K}^{*0})=0.17\ifmmode\pm\else\textpm\fi{}0.08\ifmmode\pm\else\textpm\fi{}0.01$, ${\mathcal{A}}_{CP}(\ensuremath{\eta}{K}^{*+})=0.03\ifmmode\pm\else\textpm\fi{}0.10\ifmmode\pm\else\textpm\fi{}0.01$, and ${\mathcal{A}}_{CP}(\ensuremath{\eta}{\ensuremath{\rho}}^{+})=\ensuremath{-}{0.04}_{\ensuremath{-}0.32}^{+0.34}\ifmmode\pm\else\textpm\fi{}0.01$.

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