Possible contributions to $e^{+}{e}^{-}\to J/\psi +{\eta }_c$ due to intermediate meson rescatterings

Abstract

Inspired by the obvious discrepancies between experiment and non-relativistic QCD (NRQCD) studies of $e^{+}{e}^{-}\to J/\psi +{\eta }_c$ at $\sqrt{s}\simeq 10.6$ GeV, we investigate contributions from intermediate meson loops as long-range interaction transitions to this process. The intermediate meson loops include $D\bar{D}({\bar{D}}^{\ast })$, $D{\bar{D}}^{\ast }(Dor{D}^{\ast })$, $D^{\ast }{\bar{D}}^{\ast }(D)$ and corresponding $D_s$ intermediate mesons. With the constraints from experimental data on the vertex couplings, we find that the intermediate meson loops account for $2.7\sim 6.7fb$ 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 $0.58\sim 1.38fb$. These results imply that contributions from long-range interaction transitions may still play a role in such an energy region.

revised version to appear in Phys. Rev. D

References in corpus (6)

• Relativistic corrections to $J/\psi$ exclusive and inclusive double charm production at B factories
• QCD corrections to J/psi plus eta_c production in e+e- annihilation at sqrt{s}=10.6 GeV
• Resummation of Relativistic Corrections to e+ e- -> J/psi+eta_c
• Isospin violation in $\varphi ,J/\psi ,{\psi }^{\prime }\to \omega {\pi }^0$ via hadronic loops
• Exclusive Double Charmonium Production from ${\rm Y}$ Decay
• J/psi absorption by nucleons in the meson-exchange model

Cited by in corpus (1)

• Towards a dynamical understanding of the non-$D\bar{D}$ decay of $\psi (3770)$