Next-to-Leading-Order QCD Corrections to e^ + e^- -> J/\psi+gg at the B Factories

TL;DR

This paper calculates the NLO QCD corrections to the process e+e- -> J/psi + gg at B factories, showing significant cross section enhancement and providing predictions consistent with Belle measurements, aiding J/psi polarization studies.

Contribution

The paper provides the first detailed NLO QCD correction calculations for e+e- -> J/psi + gg at B factories, including cross section and polarization predictions.

Findings

NLO corrections increase the cross section by about 21%.

Including feed-down effects raises the cross section to 0.482 pb.

Predictions agree well with recent Belle experimental data.

Abstract

We calculate the next-to-leading-order (NLO) QCD corrections to $e^+e^-\to J/\psi g g$ via color singlet $J/\psi(^3{-0.8mm}S_1)$ at the B factories. The result shows that the cross section is enhanced to $0.373\pb$ by a K factor (NLO/LO) of about 1.21. By considering its dependence on the charm quark mass and renormalization scale, the NLO cross section can range from 0.294 to $0.409\pb$. Further including the $\psi^\prime$ feed-down, $\sigma(e^+e^-\to \jpsi X(\mathrm{non} c\bar{c}))$ is enhanced by another factor of about 1.29 and reaches $0.482\pb$. In addition, the momentum distributions of $J/\psi$ production and polarization are presented. Recent measurements from Belle agree well with our prediction for the cross section and momentum distribution. It is expected that this process can serve as a very good channel to clarify the $J/\psi$ polarization puzzle by performing further experimental measurements.