Measurements of $\psi(2S)$ decays into Vector- Tensor final states

TL;DR

This study measures the decay rates of the $ ext{ψ(2S)}$ particle into vector-tensor meson pairs, providing more precise data that confirms deviations from the expected 12% rule in these decay channels.

Contribution

The paper presents new, more accurate measurements of $ ext{ψ(2S)}$ decays into vector-tensor final states, confirming rule violation with improved precision.

Findings

Branching fractions for specific $ ext{ψ(2S)}$ decay modes are determined.

Results confirm violation of the 12% rule in $ ext{ψ(2S)}$ decays to VT channels.

Improved measurements over previous BESI results.

Abstract

Decays of the $\psi(2S)$ into vector plus tensor meson final states have been studied with 14 million $\psi(2S)$ events collected with the BESII detector. Branching fractions of $\psi(2S) \rt \omega f_{2}(1270)$, $\rho a_2(1320)$, $K^*(892)^0\bar{K}^*_2(1430)^0+c.c.$ and $\phi f_2^{\prime}(1525)$ are determined. They improve upon previous BESI results and confirm the violation of the "12%" rule for $\psi(2S)$ decays to VT channels with higher precision.