Measurements ofψ(3686)→K−ΛΞ¯++c.c.andψ(3686)→γK−ΛΞ¯++c.c.

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Abstract

Using a sample of $1.06\ifmmode\times\else\texttimes\fi{}1{0}^{8}\ensuremath{\psi}(3686)$ events produced in ${e}^{+}{e}^{\ensuremath{-}}$ collisions at $\sqrt{s}=3.686\text{ }\text{ }\mathrm{GeV}$ and collected with the BESIII detector at the BEPCII collider, we present studies of the decays $\ensuremath{\psi}(3686)\ensuremath{\rightarrow}{K}^{\ensuremath{-}}\mathrm{\ensuremath{\Lambda}}{\overline{\mathrm{\ensuremath{\Xi}}}}^{+}+\mathrm{c}.\mathrm{c}.$ and $\ensuremath{\psi}(3686)\ensuremath{\rightarrow}\ensuremath{\gamma}{K}^{\ensuremath{-}}\mathrm{\ensuremath{\Lambda}}{\overline{\mathrm{\ensuremath{\Xi}}}}^{+}+\mathrm{c}.\mathrm{c}.$. We observe two hyperons, $\mathrm{\ensuremath{\Xi}}(1690{)}^{\ensuremath{-}}$ and $\mathrm{\ensuremath{\Xi}}(1820{)}^{\ensuremath{-}}$, in the ${K}^{\ensuremath{-}}\mathrm{\ensuremath{\Lambda}}$ invariant mass distribution in the decay $\ensuremath{\psi}(3686)\ensuremath{\rightarrow}{K}^{\ensuremath{-}}\mathrm{\ensuremath{\Lambda}}{\overline{\mathrm{\ensuremath{\Xi}}}}^{+}+\mathrm{c}.\mathrm{c}.$ with significances of $4.9\ensuremath{\sigma}$ and $6.2\ensuremath{\sigma}$, respectively. The branching fractions of $\ensuremath{\psi}(3686)\ensuremath{\rightarrow}{K}^{\ensuremath{-}}\mathrm{\ensuremath{\Lambda}}{\overline{\mathrm{\ensuremath{\Xi}}}}^{+}+\mathrm{c}.\mathrm{c}.$, $\ensuremath{\psi}(3686)\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\mathrm{\ensuremath{\Sigma}}}^{0}{\overline{\mathrm{\ensuremath{\Xi}}}}^{+}+\mathrm{c}.\mathrm{c}.$, $\ensuremath{\psi}(3686)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\chi}}_{cJ}\ensuremath{\rightarrow}\ensuremath{\gamma}{K}^{\ensuremath{-}}\mathrm{\ensuremath{\Lambda}}{\overline{\mathrm{\ensuremath{\Xi}}}}^{+}+\mathrm{c}.\mathrm{c}.$ ($J=0$, 1, 2), and $\ensuremath{\psi}(3686)\ensuremath{\rightarrow}\mathrm{\ensuremath{\Xi}}(1690/1820{)}^{\ensuremath{-}}{\overline{\mathrm{\ensuremath{\Xi}}}}^{+}+\mathrm{c}.\mathrm{c}.$ with subsequent decay $\mathrm{\ensuremath{\Xi}}(1690/1820{)}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}\mathrm{\ensuremath{\Lambda}}$ are measured for the first time.

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