Measurements of Selectedψ(3684)Branching Ratios from a Study of Secondary Lepton Pairs

We determine the ratio of the partial decay width for $\psi \mathrm{}\left(3684\right)\mathrm{}\to {\mu }^{+}{\mu }^{-}$ to that for the cascade decay $\psi \mathrm{}\left(3684\right)\mathrm{}\to \psi \mathrm{}\left(3095\right)+X$ to be (1.4 ± 0.3)% and, by direct observation of associated charged particles and $\gamma$ rays, find the ratio of the partial decay width for $\psi \mathrm{}\left(3684\right)\mathrm{}\to \psi \mathrm{}\left(3095\right)+{\pi }^0{\pi }^0$ to that for $\psi \mathrm{}\left(3684\right)\mathrm{}\to \psi \mathrm{}\left(3095\right)+{\pi }^{+}{\pi }^{-}$ to be 0.64 ± 0.15.