Measurement of the branching ratios $\ddot{I}{ˆ}^{\prime }\to e^{+}{e}^{-}$, $\ddot{I}{ˆ}^{\prime }\to J/\ddot{I}ˆ\ddot{I}€\ddot{I}€$ and $\ddot{I}{ˆ}^{\prime }\to J/\ddot{I}ˆ\hat{I}\cdot$

Abstract

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