We search for the e^+ e^- ₁ ₉ (J=0, 1, 2) processes at center-of-mass energies s = 10. 653, 10. 701, 10. 746, and 10. 804~ GeV. These data were collected with the Belle II detector at the SuperKEKB collider and correspond to 3. 5, 1. 6, 9. 8, and 4. 7~fb^- 1 of integrated luminosity, respectively. We set upper limits at the 90% confidence level on the Born cross sections for e^+ e^- ₁ ₉ at each center-of-mass energy s near 10. 746 GeV. The upper limits at 90% confidence level on the Born cross sections for e^+ e^- ₁ ₁ are significantly smaller than the corresponding measured values for e^+ e^- ₁ ₁ and e^+ e^- ^+ ^- (2 S) at s = 10. 746 ~GeV.
Abumusabh et al. (Thu,) studied this question.