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

TL;DR

This paper calculates NLO QCD corrections to J/psi plus eta_c production in e+e- annihilation at 10.6 GeV, revealing a significant K factor and potential large NNLO effects, highlighting challenges in perturbative convergence.

Contribution

First analytic calculation of NLO QCD corrections for J/psi plus eta_c production at this energy, with insights into higher-order correction significance.

Findings

NLO K factor approximately 2, consistent with previous results.

NNLO corrections may be substantial, affecting theoretical predictions.

Perturbative QCD convergence worsens at higher energies without resummation.

Abstract

Next-to-Leading-Order(NLO) QCD corrections to J/jpsi plus eta_c production in e+e- annihilation at sqrt{s}=10.6 GeV is calculated in this paper, and an analytic result is obtained. By choosing proper physical parameters, a K factor (ratio of NLO to LO) of about 2, which is in agreement with the result in Ref.\cite{Zhang:2005ch}, is obtained. Our results show that the Next-Next-to-Leading-Order(NNLO) corrections might be quite large. The plot of the K-factor vs the center-of-mass energy sqrt{s} shows that it is more difficult to obtain a convergent result from the perturbative QCD without resummation of ln(s/m_c) terms as the sqrt{s} becomes larger.