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${{\mathit \psi}{(4660)}}$
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${{\mathit \psi}{(4660)}}$ $\rightarrow$ ${{\mathit \Sigma}^{+}}{{\overline{\mathit \Sigma}}^{-}}$
${{\mathit \psi}{(4660)}}$ $\rightarrow$ ${{\mathit \Sigma}^{+}}{{\overline{\mathit \Sigma}}^{-}}$
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$\Gamma($ ${{\mathit \psi}{(4660)}}$ $\rightarrow$ ${{\mathit \Sigma}^{+}}{{\overline{\mathit \Sigma}}^{-}})$ ${\times }$ $\Gamma($ ${{\mathit \psi}{(4660)}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}})/\Gamma_{\text{total}}$
$\Gamma_{17}\Gamma_{1}/\Gamma$
M189R14
