Measurement of branching ratios for two-pion transitions in the bottomonium system

Using approximately 9 million $\Upsilon(2S)$ decays and 6 million $\Upsilon(3S)$ decays, the CLEO Collaboration has made new measurements of the branching ratios for charged (via $\pi^{+}\pi^{-}$) and neutral (via $\pi^{0}\pi^{0}$) transitions among the three lowest-lying $\Upsilon(nS)$ states.