J. Z. Bai et al | Searcharxiv

arXiv2004

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

Decays of the $ψ(2S)$ into vector plus tensor meson final states have been studied with 14 million $ψ(2S)$ events collected with the BESII detector. Branching fractions of $ψ(2S) \rt ωf_{2}(1270)$, $ρa_2(1320)$, $K^*(892)^0\bar{K}^*_2(1430)^0+c.c.$ and $ϕf_2^{\prime}(1525)$ are determined. They improve upon previous BESI results and confirm the violation of the "12%" rule for $ψ(2S)$ decays to VT channels with higher precision.

hep-ex↗

arXiv2003

Partial Wave Analyses of $J/ψ\toγK^+K^-$ and $γK^0_SK^0_S$

Results are presented on $J/ψ$ radiative decays to $K^+K^-$ and $K^0_SK^0_S$ based on a sample of 58M $J/ψ$ events taken with the BES II detector. A partial wave analysis is carried out using the relativistic covariant tensor amplitude method in the 1-2 GeV mass range. There is conspicuous production due to the $f'_2(1525)$ and $f_0(1710)$. The latter peaks at a mass of $1740\pm 4^{+10}_{-25}$ MeV with a width of $166{^{+5}_{-8}}{^{+15}_{-10}}$ MeV. Spin 0 is strongly preferred over spin 2. For the $f'_2(1525)$, the helicity amplitude ratios are determined to be $x^2 = 1.00\pm0.28^{+1.06}_{-0.36}$ and $y^2 = 0.44\pm{0.08}^{+0.10}_{-0.56}$.

hep-ex↗