Observation of e+e- to K+K-J/psi via Initial State Radiation at Belle
arXiv:0709.2565 · doi:10.1103/PhysRevD.77.011105
Abstract
The process e+e- to K+K-J/psi is observed for the first time via initial state radiation. The cross section of e+e- to K+K-J/psi for center-of-mass energies between threshold and 6.0 GeV is measured using 673 fb^{-1} of data collected with the Belle detector on and off the Upsilon(4S) resonance. We also find evidence for e+e- to K_S K_S J/psi in the same energy region.
Version to appear in Physical Review D (RC)