QCD prediction for the non-DD[over ] annihilation decay of psi(3770).
To clarify the marked difference between BES and CLEO measurements on the non-DD[over ] decays of the psi(3770), a 1(3)D1-dominated charmonium, we calculate the annihilation decay of psi(3770) in nonrelativistic QCD. By introducing the color-octet contributions, the results are free from infrared divergences. The color-octet matrix elements are estimated by solving the evolution equations. The S-D mixing effect is found to be very small. With m_{c}=1.5+/-0.1 GeV, our result is Gamma(psi(3770)-->light hadrons)=467(+338);(-187) keV. For mc=1.4 GeV, together with the observed hadronic transitions and E1 transitions, the non-DD[over ] decay branching ratio of psi(3770) could reach about 5%. Our results do not favor the results of either the BES or the CLEO Collaborations, and further experimental tests are urged.
Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
Zhi-Guo
ZG
He
Ying
Y
Fan
Kuang-Ta
KT
Chao