The cross section for the process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}J/\ensuremath{\psi}$ is measured precisely at center-of-mass energies from 3.77 to 4.60 GeV using $9\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data ...
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