Measurement of the parameters of theψ(3770)resonance

Abstract

We present a measurement of the cross section for hadron production by $e^{+}{e}^{-}$ annihilation in the vicinity of the previously observed resonance near 3.77 GeV. The data are used to determine the parameters of the $\psi \mathrm{}\left(3770\right)\mathrm{}$ resonance. The values found are: mass, 3764±5 ${\mathrm{M}\mathrm{e}\mathrm{V}/\mathit{c}}^2$, total width, 23.5±5 MeV, and partial width to electron pairs, 276±50 eV.