Measurements of $\ddot{I}ˆ(2S)$ decays into $\ddot{I}•\ddot{I}{€}^0$, $\ddot{I}•\hat{I}\cdot$, $\ddot{I}•\hat{I}{\cdot }^{{}^{\prime }}$, $\ddot{I}‰\hat{I}\cdot$, and $\ddot{I}‰\hat{I}{\cdot }^{{}^{\prime }}$

Abstract

Decays of the $\ddot{I}ˆ(2S)$ into Vector plus Pseudoscalar meson final states have been studied with 14 million $\ddot{I}ˆ(2S)$ events collected with the BESII detector. Branching fractions of $ψ(2S) \rarϕη$, $ϕ\etap$, and $ω\etap$, and upper limits of $ψ(2S) \rar ϕ\piz$ and $\ddot{I}‰\hat{I}\cdot$ are obtained: $B(ψ(2S) \rarϕη) = (3.3\pm 1.1 \pm 0.5) \times 10^{-5}$, $B(ψ(2S) \rarϕ\etap) = (3.1\pm 1.4 \pm 0.7)\times 10^{-5}$, and $B(ψ(2S) \rarω\etap) = (3.2^{+2.4}_{-2.0} \pm 0.7) \times 10^{-5}$; and $B(ψ(2S) \rarϕ\piz) < 0.40 \times 10^{-5}$, and $B(ψ(2S) \rarωη) < 3.1 \times 10^{-5}$ at the 90 % C.L.. These results are used to test the pQCD ``12% rule''.

7 pages, 7 figures, 2 tables