Upper limit on the absolute branching fraction forDs+→φπ+

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 $D_s^{+}$→φ${\pi }^{+}$. A search is made for fully reconstructed events from the reaction $e^{+}$ $e^{\mathrm{-}}$→$D_s^{\mathrm{*}\pm }$ $D_s^{\mp }$, $D_s^{\mathrm{*}\pm }$→γ$D_s^{\pm }$, using seven exclusive $D_s^{+}$ decay modes. The data sample of 6.30±0.46 ${\mathrm{ppb}}^{\mathrm{-}1}$ was collected at √s¯=4.14 GeV with the Mark III detector at the SLAC ${\mathit{e}}^{+}$ ${\mathit{e}}^{\mathrm{-}}$ storage ring SPEAR. No candidate events are observed. The measured relative $D_s^{+}$ branching fractions and σB($D_s^{+}$→φ${\pi }^{+}$) are used to establish the limit B($D_s^{+}$→φ${\pi }^{+}$)<4.1% at 90% confidence level.