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We have measured several branching ratios for $\psi^\prime$ decay using thedata collected by FNAL E835 experiment during year 2000, obtaining ${\calB}(\psi^\prime \to e^+ e^-) = 0.0068\pm0.0001\pm0.0004$, ${\cal B}(\psi^\prime\to J/\psi \pi^+ \pi^-) = 0.292\pm0.005\pm0.018$, ${\cal B}(\psi^\prime \toJ/\psi \pi^0 \pi^0) = 0.167\pm0.005\pm0.014$ and ${\cal B}(\psi^\prime \toJ/\psi \eta) = 0.028\pm0.002\pm0.002$. We also present a measurement of thedipion mass distribution in the decays $\psi^\prime \to J/\psi \pi \pi$

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

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Measurement of the branching ratiosψ′→e+e−,ψ′→J/