Possible contributions to e+e- → J/ψ+ ηc due to intermediate meson rescatterings

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Inspired by the obvious discrepancies between experiment and non-relativistic QCD (NRQCD) studies of e+ e-→ J/ψ+ηc at √s≃ 10.6 GeV, we investigate contributions from intermediate meson loops as long-range interaction transitions to this process. The intermediate meson loops include D D(D), D D(D or D), D D(D) and corresponding Dₛ intermediate mesons. With the constraints from experimental data on the vertex couplings, we find that the intermediate meson loops account for 2.7 6.7 fb of the cross sections within a reasonable range of cut-off energies of the factor parameter. We also investigate contributions from the absorptive part and find that it accounts for approximately 0.58 1.38 fb. These results imply that contributions from long-range interaction transitions may still play a role in such an energy region.