QCD corrections to double J/\psi production in e+e- annihilation at \sqrt{s}=10.6 GeV

TL;DR

This paper calculates next-to-leading-order QCD corrections to double J/psi production in electron-positron collisions at 10.6 GeV, showing significant cross section reduction and explaining experimental non-observation.

Contribution

It provides the first detailed NLO QCD correction analysis for double J/psi production at B factory energies, clarifying previous discrepancies.

Findings

NLO corrections reduce the cross section significantly.

Renormalization scale dependence introduces large uncertainties.

Combined corrections explain non-observation of double J/psi at B factories.

Abstract

Next-to-Leading-Order(NLO) QCD corrections to double J/psi production in e^+e^- annihilation at sqrt{s}=10.6 GeV are calculated. We find that they greatly decrease the cross section, with a K factor (NLO/LO) ranging from -0.31 to 0.25 depending on the renormalization scale. Although the renormalization scale dependence indicates a large uncertainty, when combined with the NLO QCD corrections to J/psi + eta_c production, it can explain why the double J/psi$ production could not be found at B factories while the J/psi + eta_c production could, despite the fact that cross section of the former is larger than that of the latter at LO by a factor of 1.8.