Measurements of the Branching Fractions of Exclusive Charmless B Meson Decays with η′ or ω Mesons

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We present the results of searches for $B$ decays to charmless two-body final states containing ${\ensuremath{\eta}}^{\ensuremath{'}}$ or $\ensuremath{\omega}$ mesons, based on $20.7{\mathrm{fb}}^{\ensuremath{-}1}$ of data collected with the BABAR detector. We find the branching fractions $B({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{K}^{+})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}(70\ifmmode\pm\else\textpm\fi{}8\ifmmode\pm\else\textpm\fi{}5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, $B({B}^{0}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{K}^{0})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}({42}_{\ensuremath{-}11}^{+13}\ifmmode\pm\else\textpm\fi{}4)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, and $B({B}^{+}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\pi}}^{+})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}({6.6}_{\ensuremath{-}1.8}^{+2.1}\ifmmode\pm\else\textpm\fi{}0.7)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, where the first error quoted is statistical and the second is systematic. We give measurements of four additional modes for which the $90%$ confidence level upper limits are $B({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{\ensuremath{\pi}}^{+})<12\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, $B({B}^{+}\ensuremath{\rightarrow}\ensuremath{\omega}{K}^{+})<4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, $B({B}^{0}\ensuremath{\rightarrow}\ensuremath{\omega}{K}^{0})<13\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, and $B({B}^{0}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\pi}}^{0})<3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$.

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