Measurements of $\psip$ decays into $\gamma K\bar{K}\pi$ and $\gamma\eta\pipi$

TL;DR

This study measures radiative decay modes of the $ ext{ψ'}$ particle into specific final states, setting upper limits on certain branching fractions using data from 14 million events.

Contribution

First measurement of $ ext{ψ'}$ radiative decays into $ ext{γ}Kar{K} ext{π}$ and $ ext{γ} ext{η} ext{π} ext{π}$, providing new upper limits on branching fractions.

Findings

No significant signals for $ ext{η}_ ext{f}$ decays observed.

Upper limits established for $ ext{ψ'} ightarrow ext{γ} ext{η}_ ext{f}$ decays.

Branching fractions constrained for $ ext{ψ'}$ and $ ext{η}_ ext{f}$ decays.

Abstract

Radiative decays of the $\psip$ into $\gamma K\bar{K}\pi$ and $\gamma\eta\pipi$ final states are studied using 14 million $\psip$ events collected with the BESII detector. Branching fractions or upper limits on the branching fractions of $\psip$ and $\xcj$ decays are reported. No significant signal for $\etafl/\etafh$ is observed in the $K\bar{K}\pi$ or $\eta\pipi$ mass spectra, and upper limits on the branching fractions of $\psip\rar\gamma\etaf$, $\etaf\rar K\bar{K}\pi$ and $\eta\pipi$ are determined.