title: Next-to-leading-order QCD corrections to J/psi polarization at Tevatron and Large-Hadron-Collider energies.
abstract: We calculate the next-to-leading-order QCD corrections to J/psi polarization at the Fermilab Tevatron and CERN Large Hadron Collider. Our results show that the J/psi polarization status drastically changes from transverse-polarization dominant at leading order to longitudinal-polarization dominant at next-to-leading order. Although the theoretical evaluation predicts a larger longitudinal polarization than the value measured at the Tevatron, it may provide a solution towards the previous large discrepancy for J/psi polarization between theoretical predication and experimental measurement.
authors.affiliation: Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Gong
authors.forename: Jian-Xiong
authors.initials: JX
authors.lastname: Wang