Measurements ofψ(2S)decays intoγKK¯πandγηπ+π−

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Abstract

Radiative decays of the $\ensuremath{\psi}(2S)$ into $\ensuremath{\gamma}K\overline{K}\ensuremath{\pi}$ and $\ensuremath{\gamma}\ensuremath{\eta}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ final states are studied using $14\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\psi}(2S)$ events collected with the BESII detector. Branching fractions or upper limits on the branching fractions of $\ensuremath{\psi}(2S)$ and ${\ensuremath{\chi}}_{cJ}$ decays are reported. No significant signal for $\ensuremath{\eta}(1405)/\ensuremath{\eta}(1475)$ is observed in the $K\overline{K}\ensuremath{\pi}$ or $\ensuremath{\eta}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ mass spectra, and upper limits on the branching fractions of $\ensuremath{\psi}(2S)\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\eta}(1405)/\ensuremath{\eta}(1475)$, $\ensuremath{\eta}(1405)/\ensuremath{\eta}(1475)\ensuremath{\rightarrow}K\overline{K}\ensuremath{\pi}$, and $\ensuremath{\eta}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ are determined.

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