Observation of a New<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>D</mml:mi><mml:mi>s</mml:mi></mml:msub></mml:math>Meson Decaying to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>D</mml:mi><mml:mi>K</mml:mi></mml:math>at a Mass of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>2.86</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>GeV</mml:mi><mml:mo>/</mml:mo><mml:msup><mml:mi>c</mml:mi><mml:mn>2</mml:mn></mml:msup></mml:math>

We observe a new ${D}_{s}$ meson with mass $(2856.6\ifmmode\pm\else\textpm\fi{}{1.5}_{\mathrm{stat}}\ifmmode\pm\else\textpm\fi{}{5.0}_{\mathrm{syst}})\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ and width $(48\ifmmode\pm\else\textpm\fi{}{7}_{\mathrm{stat}}\ifmmode\pm\else\textpm\fi{}{10}_{\mathrm{syst}})\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ decaying into ${D}^{0}{K}^{+}$ and ${D}^{+}{K}_{S}^{0}$. In the same mass distributions, we also observe a broad structure with mass $(2688\ifmmode\pm\else\textpm\fi{}{4}_{\mathrm{stat}}\ifmmode\pm\else\textpm\fi{}{3}_{\mathrm{syst}})\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ and width $(112\ifmmode\pm\else\textpm\fi{}{7}_{\mathrm{stat}}\ifmmode\pm\else\textpm\fi{}{36}_{\mathrm{syst}})\text{ }\text{ }\mathrm{MeV}/{c}^{2}$. To obtain this result, we use $240\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data recorded by the BABAR detector at the PEP-II asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ storage rings at the Stanford Linear Accelerator Center running at center-of-mass energies near 10.6 GeV.

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