On the Electric Dipole Transition of ψ (3770)

Qin Danhua; Ding Yibing; Chao Kuangta

Chinese Physics C> 1990, Vol. 14> Issue(S2) : 173-177

On the Electric Dipole Transition of ψ (3770)

Physics Department, Beijing University, Department of Physics, Graduate School, Chinese Academy of Sciences, Center of Theoretical Physics, CCA ST(World Laboratory) and Physics Department, Beijing University

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Various E1 transition rates for cc states are calculated in a QCD-motivated potential model. Relativistic corrections are found to be substantial. A good agreement between theory and experiment is achieved for the rates of ψ(2S)→YX_eJ and X_eJ→γψ(1S) (J=0,1,2), but the calculated rates for ψ(3770)→YX_eJ are smaller by a factor of 2 than their experimental values obtained by the Mark III Collaboration. The effect of the 2³S_l-1³D₁ mixing may be important and needs to be considered.

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Qin Danhua, Ding Yibing and Chao Kuangta. On the Electric Dipole Transition of ψ (3770)[J]. Chinese Physics C, 1990, 14(S2): 173-177.

Qin Danhua, Ding Yibing and Chao Kuangta. On the Electric Dipole Transition of ψ (3770)[J]. Chinese Physics C, 1990, 14(S2): 173-177. shu

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Received: 1989-11-23

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Supported in part by the National Natural Science Foundation of China.

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沈阳化工大学材料科学与工程学院沈阳 110142

On the Electric Dipole Transition of ψ (3770)

Physics Department, Beijing University, Department of Physics, Graduate School, Chinese Academy of Sciences, Center of Theoretical Physics, CCA ST(World Laboratory) and Physics Department, Beijing University

Received Date: 1989-11-23

Fund Project: Supported in part by the National Natural Science Foundation of China.

Abstract: Various E1 transition rates for cc states are calculated in a QCD-motivated potential model. Relativistic corrections are found to be substantial. A good agreement between theory and experiment is achieved for the rates of ψ(2S)→YX_eJ and X_eJ→γψ(1S) (J=0,1,2), but the calculated rates for ψ(3770)→YX_eJ are smaller by a factor of 2 than their experimental values obtained by the Mark III Collaboration. The effect of the 2³S_l-1³D₁ mixing may be important and needs to be considered.