Study of J/ψ and ψ(3686) decay to ΛΛ¯ and Σ0Σ¯0 final states

Citations Over TimeTop 10% of 2017 papers

Abstract

Using $1310.6\ifmmode\times\else\texttimes\fi{}1{0}^{6}\text{ }\text{ }J/\ensuremath{\psi}$ and $447.9\ifmmode\times\else\texttimes\fi{}1{0}^{6}\text{ }\text{ }\ensuremath{\psi}(3686)$ events collected with the BESIII detector at the BEPCII ${e}^{+}{e}^{\ensuremath{-}}$ collider, the branching fractions and the angular distributions of $J/\ensuremath{\psi}$ and $\ensuremath{\psi}(3686)$ decays to $\mathrm{\ensuremath{\Lambda}}\overline{\mathrm{\ensuremath{\Lambda}}}$ and ${\mathrm{\ensuremath{\Sigma}}}^{0}{\overline{\mathrm{\ensuremath{\Sigma}}}}^{0}$ final states are measured. The branching fractions are determined, with much improved precision, to be $19.43\ifmmode\pm\else\textpm\fi{}0.03\ifmmode\pm\else\textpm\fi{}0.33$, $11.64\ifmmode\pm\else\textpm\fi{}0.04\ifmmode\pm\else\textpm\fi{}0.23$, $3.97\ifmmode\pm\else\textpm\fi{}0.02\ifmmode\pm\else\textpm\fi{}0.12$ and $2.44\ifmmode\pm\else\textpm\fi{}0.03\ifmmode\pm\else\textpm\fi{}0.11$ for $J/\ensuremath{\psi}\ensuremath{\rightarrow}\mathrm{\ensuremath{\Lambda}}\overline{\mathrm{\ensuremath{\Lambda}}}$, $J/\ensuremath{\psi}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Sigma}}}^{0}{\overline{\mathrm{\ensuremath{\Sigma}}}}^{0}$, $\ensuremath{\psi}(3686)\ensuremath{\rightarrow}\mathrm{\ensuremath{\Lambda}}\overline{\mathrm{\ensuremath{\Lambda}}}$ and $\ensuremath{\psi}(3686)\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Sigma}}}^{0}{\overline{\mathrm{\ensuremath{\Sigma}}}}^{0}$, respectively. The polar angular distributions of $\ensuremath{\psi}(3686)$ decays are measured for the first time, while those of $J/\ensuremath{\psi}$ decays are measured with much improved precision. In addition, the ratios of branching fractions $\frac{\mathcal{B}(\ensuremath{\psi}(3686)\ensuremath{\rightarrow}\mathrm{\ensuremath{\Lambda}}\overline{\mathrm{\ensuremath{\Lambda}}})}{\mathcal{B}(J/\ensuremath{\psi}\ensuremath{\rightarrow}\mathrm{\ensuremath{\Lambda}}\overline{\mathrm{\ensuremath{\Lambda}}})}$ and $\frac{\mathcal{B}(\ensuremath{\psi}(3686)\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Sigma}}}^{0}{\overline{\mathrm{\ensuremath{\Sigma}}}}^{0})}{\mathcal{B}(J/\ensuremath{\psi}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Sigma}}}^{0}{\overline{\mathrm{\ensuremath{\Sigma}}}}^{0})}$ are determined to test the ``12% rule.''

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