Updated Cross Section Measurement of $e^{+}{e}^{-}\to K^{+}{K}^{-}J/\psi$ and $K_S^0{K}_S^{0}J/\psi$ via Initial State Radiation at Belle

Abstract

The cross sections of the processes $e^{+}{e}^{-}\to K^{+}{K}^{-}J/\psi$ and $K_S^0{K}_S^{0}J/\psi$ are measured via initial state radiation at center-of-mass energies between the threshold and 6.0~GeV using a data sample of 980~fb${}^{-1}$ collected with the Belle detector on or near the ${\rm Y}(nS)$ resonances, where $n=$1, 2, ..., 5. The cross sections for $e^{+}{e}^{-}\to K^{+}{K}^{-}J/\psi$ are at a few pb level and the average cross section for $e^{+}{e}^{-}\to K_S^0{K}_S^{0}J/\psi$ is $1.8\pm 0.6(stat.)\pm 0.3(syst.)$~pb between 4.4 and 5.2~GeV. All of them are consistent with previously published results with improved precision. A search for resonant structures and associated intermediate states in the cross section of the process $e^{+}{e}^{-}\to K^{+}{K}^{-}J/\psi$ is performed.

14 pages, 7 figures

References in corpus (2)

• Observation of e+e- to K+K-J/psi via Initial State Radiation at Belle
• Cross sections of e+e- --> gamma VV and e+e- --> gamma gamma V

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