Abstract
The total cross section for hadron production by ${e}^{+}{e}^{\ensuremath{-}}$ annihilation has been measured at center-of-mass energies between 2.4 and 5.0 GeV. Aside from the very narrow resonances $\ensuremath{\psi}(3105)$ and $\ensuremath{\psi}(3695)$, the cross section varies between 32 and 17 nb over this region with structure in the vicinity of 4.1 GeV.
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