title: Complete Study of Hadroproduction of a ϒ Meson Associated with a Prompt J/ψ.
abstract: We present the first complete study of ϒ and prompt J/ψ production from single-parton scattering, including the complete O(α_{S}^{6}) color-singlet contribution, the O(α_{S}^{2}α^{2}) electroweak contribution, and the complete nonrelativistic S-wave and P-wave color-octet contribution as well as the feeddown contribution. Our study was motivated by the recent evidence reported by the D0 Collaboration of prompt J/ψ and ϒ simultaneous production at the Tevatron. With our complete evaluation, we are able to refine the determination of the double-parton scattering contribution made by the D0 Collaboration. We find that the effective cross section characterizing the importance of double-parton scatterings is σ_{eff}≤8.2  mb at 68% confidence level from the D0 measurement.
authors.affiliation: Theoretical Physics Department, CERN, CH-1211 Geneva 23, Switzerland.
authors.forename: Hua-Sheng
authors.initials: HS
authors.lastname: Shao
authors.affiliation: Beijing Key Laboratory of Advanced Nuclear Energy Materials and Physics, and School of Physics, Beihang University, Beijing 100191, China.|CAS Center for Excellence in Particle Physics, Beijing 100049, China.
authors.forename: Yu-Jie
authors.initials: YJ
authors.lastname: Zhang