Observation ofBs0→J/ψK*(892)0andBs0→J/ψKS0decays

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Abstract

We report the first observation of two Cabibbo-suppressed decay modes of the ${B}_{s}^{0}$ meson. Using a sample of $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$ corresponding to $5.9\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of integrated luminosity collected with the CDF II, the collider detector at the Fermilab Tevatron, we search for new ${B}_{s}^{0}$ decay modes in a sample of events containing $J/\ensuremath{\psi}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ decays. We reconstruct a ${B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{*}(892{)}^{0}$ signal with ${K}^{*}(892{)}^{0}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, observing a yield of $151\ifmmode\pm\else\textpm\fi{}25$ events with a statistical significance of $8.0\ensuremath{\sigma}$. We also reconstruct a ${B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}_{S}^{0}$ signal with ${K}_{S}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, observing a yield of $64\ifmmode\pm\else\textpm\fi{}14$ events with a statistical significance of $7.2\ensuremath{\sigma}$. From these yields, we extract the branching ratios $\mathcal{B}({B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{*}(892{)}^{0})=(8.3\ifmmode\pm\else\textpm\fi{}3.8)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ and $\mathcal{B}({B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{0})=(3.5\ifmmode\pm\else\textpm\fi{}0.8)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, where statistical, systematic, and fragmentation-fraction uncertainties are included in the combined uncertainty.

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