We have measured several branching ratios for ${\psi }^{\prime }$ decay using the data collected by the FNAL E835 experiment during the year 2000, obtaining $\mathcal{B}({\psi }^{\prime }\to e^{+}{e}^{-})=0.0068\pm 0.0001\pm 0.0004$, $\mathcal{B}({\psi }^{\prime }\to J/\psi {\pi }^{+}{\pi }^{-})=0.292\pm 0.005\pm 0.018$, $\mathcal{B}({\psi }^{\prime }\to J/\psi {\pi }^0{\pi }^0)=0.167\pm 0.005\pm 0.014$, and $\mathcal{B}({\psi }^{\prime }\to J/\psi \eta )=0.028\pm 0.002\pm 0.002$. We also present a measurement of the dipion mass distribution in the decays ${\psi }^{\prime }\to J/\psi \pi \pi$.

• Received 6 August 2004

DOI:https://doi.org/10.1103/PhysRevD.71.032006