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Study of e+e- -> h+h- J/psi (h = pi, K, p) via initial-state radiation at Belle II

Physical Review Letters. 2026. Vol. D. No. 113. Article 112010.
Pakhlov P., Pakhlova G., Bodrov D., Aushev Т., Abumusabh М.

Using a data sample of 427.9 fb^-1 collected by the Belle II detector at or near the Upsilon(4S) and Upsilon(10753) resonances, the cross sections for e+ e- -> h+ h- J/psi (h = pi/K/p) at center-of-mass energies ranging from 3.8 GeV or the production threshold to 5.5/6.0/7.0 GeV have been measured via initial-state radiation. The cross sections for the processes e+ e- -> pi+ pi- J/psi and e+ e- -> K+ K- J/psi are consistent with previously published results. The cross sections for these channels obtained by combining with previous Belle results are also given. The process e+ e- -> p pbar J/psi is investigated for the first time. The yields are small and no significant structure is observed in the cross section versus energy. Searches for vector charmoniumlike states in the h+ h- J/psi systems, and for associated intermediate states in the h+- J/psi systems, are also presented.

Research target: Physics
Language: English
Full text
DOI
Keywords: Belle II
Publication based on the results of:
Search for New physics in the experiments on e+e- colliders (2025)
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