title: Polarizations of χc1 and χc2 in prompt production at the LHC.
abstract: Prompt χc production at hadron colliders may provide a unique test for the color-octet mechanism in nonrelativistic QCD. We present an analysis for the polarization observables of χc1 and χc2 at next-to-leading order in αS and propose to measure them at the LHC, which is expected to be important for testing the validity of nonrelativistic QCD.
authors.affiliation: School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: Hua-Sheng
authors.initials: HS
authors.lastname: Shao
authors.affiliation: Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: Yan-Qing
authors.initials: YQ
authors.lastname: Ma
authors.affiliation: School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Wang
authors.affiliation: School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China and Collaborative Innovation Center of Quantum Matter, Beijing 100871, China and Center for High Energy Physics, Peking University, Beijing 100871, China.
authors.forename: Kuang-Ta
authors.initials: KT
authors.lastname: Chao