title: Impact of η(c) hadroproduction data on charmonium production and polarization within the nonrelativistic QCD framework.
abstract: With the recent LHCb data on η_{c} production and based on heavy quark spin symmetry, we obtain the long-distance matrix elements for both η_{c} and J/ψ productions, among which, the color-singlet one for η_{c} is obtained directly by the fit of experiment for the first time. Using our long-distance matrix elements, we can provide good description of the η_{c} and J/ψ hadroproduction measurements. Our predictions on J/ψ polarization are in good agreement with the LHCb data, explain most of the CMS data, and pass through the two sets of CDF measurements in the medium p_{t} region. Considering all the possible uncertainties carefully, we obtained quite narrow bands of the J/ψ polarization curves.
authors: Department of Physics, School of Biomedical Engineering, Third Military Medical University, Chongqing 400038, China.
authors: Hong-Fei
authors: HF
authors: Zhang
authors: Department of Physics, Chongqing University, Chongqing 401331, People's Republic of China.
authors: Zhan
authors: Z
authors: Sun
authors: School of Physical Science and Technology, Southwest University, Chongqing 400700, China.|State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors: Wen-Long
authors: WL
authors: Sang
authors: Department of Applied Physics, Xi'an Jiaotong University, Xi'an 710049, China.
authors: Rong
authors: R
authors: Li
mesh_terms: D004601:Elementary Particles; D008962:Models, Theoretical; D009686:Nuclear Physics; D011789:Quantum Theory