B meson decays to η(′)K*, η(′)ρ, η(′)π0, ωπ0, and φπ0

Abstract

We present measurements of the branching fractions and charge asymmetries (where appropriate) of two-body B decays to ${\ensuremath{\eta}}^{(\ensuremath{'})}{K}^{*},$ ${\ensuremath{\eta}}^{(\ensuremath{'})}\ensuremath{\rho},$ ${\ensuremath{\eta}}^{(\ensuremath{'})}{\ensuremath{\pi}}^{0},$ $\ensuremath{\omega}{\ensuremath{\pi}}^{0},$ and $\ensuremath{\varphi}{\ensuremath{\pi}}^{0}.$ The data were recorded with the BABAR detector at PEP-II and correspond to $89\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs produced in ${e}^{+}{e}^{\ensuremath{-}}$ annihilation through the $\ensuremath{\Upsilon}(4S)$ resonance. We find significant signals for two decay modes and measure the branching fractions $\mathcal{B}{(B}^{+}\ensuremath{\rightarrow}\ensuremath{\eta}{K}^{*+})=(25.6\ifmmode\pm\else\textpm\fi{}4.0\ifmmode\pm\else\textpm\fi{}2.4)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ and $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}\ensuremath{\eta}{K}^{*0})=(18.6\ifmmode\pm\else\textpm\fi{}2.3\ifmmode\pm\else\textpm\fi{}1.2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ where the first error is statistical and the second systematic. We also find evidence with significance 3.5\ensuremath{\sigma} for a third decay mode and measure $\mathcal{B}{(B}^{+}\ensuremath{\rightarrow}\ensuremath{\eta}{\ensuremath{\rho}}^{+})=(9.2\ifmmode\pm\else\textpm\fi{}3.4\ifmmode\pm\else\textpm\fi{}1.0)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}.$ For other channels, we set 90% C.L. upper limits of $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}\ensuremath{\eta}{\ensuremath{\rho}}^{0})<1.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ $\mathcal{B}{(B}^{+}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{K}^{*+})<14\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{K}^{*0})<7.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ $\mathcal{B}{(B}^{+}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{\ensuremath{\rho}}^{+})<22\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{\ensuremath{\rho}}^{0})<4.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}\ensuremath{\eta}{\ensuremath{\pi}}^{0})<2.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{\ensuremath{\pi}}^{0})<3.7\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\pi}}^{0})<1.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6},$ and $\mathcal{B}{(B}^{0}\ensuremath{\rightarrow}\ensuremath{\varphi}{\ensuremath{\pi}}^{0})<1.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}.$ For self-flavor-tagging modes with significant signals, the time-integrated charge asymmetries are ${\mathcal{A}}_{\mathrm{ch}}(\ensuremath{\eta}{K}^{*+})=+0.13\ifmmode\pm\else\textpm\fi{}0.14\ifmmode\pm\else\textpm\fi{}0.02$ and ${\mathcal{A}}_{\mathrm{ch}}(\ensuremath{\eta}{K}^{*0})=+0.02\ifmmode\pm\else\textpm\fi{}0.11\ifmmode\pm\else\textpm\fi{}0.02.$