Observation of e+e- to K+K-J/psi via Initial State Radiation at Belle
C. Z. Yuan, et al, Belle Collaboration
TL;DR
This paper reports the first observation of the process e+e- to K+K-J/psi via initial state radiation, measuring its cross section and providing evidence for related processes in the 4.0-6.0 GeV energy range.
Contribution
It presents the first observation of e+e- to K+K-J/psi via initial state radiation and measures its cross section using Belle data.
Findings
First observation of e+e- to K+K-J/psi via initial state radiation
Measurement of cross section between threshold and 6.0 GeV
Evidence for e+e- to K_S K_S J/psi in the same energy region
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.
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