Observation of Tree-Level<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math>Decays with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>s</mml:mi><mml:mover accent="true"><mml:mi>s</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>Production from Gluon Radiation

We report on our search for decays proceeding via a tree-level $b\ensuremath{\rightarrow}c$ quark transition in which a gluon radiates into an $s\overline{s}$ pair. We present observations of the decays ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}_{s}^{(*)+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${\overline{B}}^{0}\ensuremath{\rightarrow}{D}_{s}^{+}{K}_{S}^{0}{\ensuremath{\pi}}^{\ensuremath{-}}$ and evidence for ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}_{s}^{+}{K}^{\ensuremath{-}}{K}^{\ensuremath{-}}$ and set upper limits on the branching fractions for ${\overline{B}}^{0}\ensuremath{\rightarrow}{D}_{s}^{*+}{K}_{S}^{0}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}_{s}^{*+}{K}^{\ensuremath{-}}{K}^{\ensuremath{-}}$ using $383\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\Upsilon}(4S)\ensuremath{\rightarrow}B\overline{B}$ events collected by the BABAR detector at SLAC. We present evidence that the invariant mass distributions of ${D}_{s}^{(*)+}{K}^{\ensuremath{-}}$ pairs from ${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}_{s}^{(*)+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}$ decays are inconsistent with the phase-space model, suggesting the presence of charm resonances lying below the ${D}_{s}^{(*)+}{K}^{\ensuremath{-}}$ threshold.

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