Radiative decays of charmonium into light mesons

Details Radiative decays of charmonium into light mesons Radiative decays of charmonium into light mesons

2006-07-25

arxiv.org/abs/hep-ph/0607278v3

Chin.Phys.Lett.23:2376-2378,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

journal version; a note on the f_2(1270) helicity added

Scientific paper

10.1088/0256-307X/23/9/008

We apply perturbative QCD to the radiative decays of charmonia $J/\psi$ and $\chi_{cJ}$ into light mesons. We perform a complete numerical calculation for the quark-gluon loop diagrams involved in these processes. The calculated $J/\psi$ decay branching ratios to P-wave mesons $f_2(1270)$ and $f_1(1285)$ fit the data well, while that of $f_0(980)$ (if treated as an $s\bar s$ meson) is predicted to be $1.6\times 10^{-4}$, which implies that $f_0(1710)$ can not be the $s\bar s$ or $(u\bar u+d\bar d)/\sqrt{2}$ meson. Decays of P-wave charmonia $\chi_{cJ}\to \rho(\omega, \phi)\gamma$ (J=0,1,2) are also studied, and the branching ratio of $\chi_{c1}\to \rho\gamma$ is predicted to be $1.4\times 10^{-5}$, which may be tested by CLEO-c and BESIII with future experiments.

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