title: Polarization for prompt J/ψ and ψ(2s) production at the Tevatron and LHC.
abstract: With nonrelativistic QCD factorization, we present the first complete next-to-leading order study on the polarization of prompt J/ψ hadroproduction by including feeddown from χ(c)((3)P(J)(1),(3)S(1)(8)) and ψ(2s) which turn out to be very important parts. By using the color-octet long-distance matrix elements obtained from a combined fit of the measurements at the Tevatron and LHC for J/ψ, ψ(2s) and χ(c), the prompt J/ψ polarization predictions are presented, and the results are in agreement with the CDF run I data (except two points), but in conflict with the CDF run II data, while they are close to the ALICE data (inclusive J/ψ). The measurements at the LHC are expected to clarify the situation.
authors.affiliation: Institute of High Energy Physics, Chinese Academy of Sciences, P. O. Box 918(4), Beijing 100049, China and Theoretical Physics Center for Science Facilities, CAS, Beijing 100049, China and Institute of Theoretical Physics, Chinese Academy of Sciences, P. O. Box 2735, Beijing 100190, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Gong
authors.affiliation: Institute of High Energy Physics, Chinese Academy of Sciences, P. O. Box 918(4), Beijing 100049, China and Theoretical Physics Center for Science Facilities, CAS, Beijing 100049, China.
authors.forename: Lu-Ping
authors.initials: LP
authors.lastname: Wan
authors.affiliation: Institute of High Energy Physics, Chinese Academy of Sciences, P. O. Box 918(4), Beijing 100049, China and Theoretical Physics Center for Science Facilities, CAS, Beijing 100049, China.
authors.forename: Jian-Xiong
authors.initials: JX
authors.lastname: Wang
authors.affiliation: Institute of High Energy Physics, Chinese Academy of Sciences, P. O. Box 918(4), Beijing 100049, China and Theoretical Physics Center for Science Facilities, CAS, Beijing 100049, China.
authors.forename: Hong-Fei
authors.initials: HF
authors.lastname: Zhang