Upper Limit On The Absolute Branching Fraction For Ds+-]Phi-Pi+

We report a study of the hadronic branching fractions of the ${D}_{s}^{+}$ meson, which is used to extract an upper limit on the absolute branching fraction for ${D}_{s}^{+}$\ensuremath{\rightarrow}\ensuremath{\varphi}${\ensuremath{\pi}}^{+}$. A search is made for fully reconstructed events from the reaction ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}${D}_{s}^{\mathrm{*}\ifmmode\pm\else\textpm\fi{}}$${D}_{s}^{\ensuremath{\mp}}$, ${D}_{s}^{\mathrm{*}\ifmmode\pm\else\textpm\fi{}}$\ensuremath{\rightarrow}\ensuremath{\gamma}${D}_{s}^{\ifmmode\pm\else\textpm\fi{}}$, using seven exclusive ${D}_{s}^{+}$ decay modes. The data sample of 6.30\ifmmode\pm\else\textpm\fi{}0.46 ${\mathrm{ppb}}^{\mathrm{\ensuremath{-}}1}$ was collected at \ensuremath{\surd}s\ifmmode\bar\else\textasciimacron\fi{}=4.14 GeV with the Mark III detector at the SLAC ${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$ storage ring SPEAR. No candidate events are observed. The measured relative ${D}_{s}^{+}$ branching fractions and \ensuremath{\sigma}B(${D}_{s}^{+}$\ensuremath{\rightarrow}\ensuremath{\varphi}${\ensuremath{\pi}}^{+}$) are used to establish the limit B(${D}_{s}^{+}$\ensuremath{\rightarrow}\ensuremath{\varphi}${\ensuremath{\pi}}^{+}$)4.1% at 90% confidence level.