Measurements of $\ensuremath{\psi}(2S)$ decays into $\ensuremath{\gamma}K\overline{K}\ensuremath{\pi}$ and $\ensuremath{\gamma}\ensuremath{\eta}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$

Measurements of $ψ (2 S)$ decays into $γ K \bar{K} π$ and $γ η π^{+} π^{-}$

M. Ablikim et al. (BES Collaboration)

Phys. Rev. D 74, 072001 – Published 4 October 2006

Abstract

Radiative decays of the $ψ (2 S)$ into $γ K \bar{K} π$ and $γ η π^{+} π^{-}$ final states are studied using $14 \times 10^{6}$ $ψ (2 S)$ events collected with the BESII detector. Branching fractions or upper limits on the branching fractions of $ψ (2 S)$ and $χ_{c J}$ decays are reported. No significant signal for $η (1405) / η (1475)$ is observed in the $K \bar{K} π$ or $η π^{+} π^{-}$ mass spectra, and upper limits on the branching fractions of $ψ (2 S) \to γ η (1405) / η (1475)$ , $η (1405) / η (1475) \to K \bar{K} π$ , and $η π^{+} π^{-}$ are determined.