Reconciling charmonium production and polarization data in the midrapidity region at hadron colliders within the nonrelativistic QCD framework

  • A thorough study reveals that the only key parameter for ψ (J/ψ, ψ') polarization at hadron colliders is the ratio <Oψ(3S1[8])>/<Oψ(3P0[8])> angle, if the velocity scaling rule holds. A slight variation of this parameter results in substantial change of the ψ polarization. We find that with equally good description of the yield data, this parameter can vary significantly. Fitting the yield data is therefore incapable of determining this parameter, and consequently, of determining the ψ polarization. We provide a universal approach to fixing the long-distance matrix elements (LDMEs) for J/ψ and ψ' production. Further, with the existing data, we implement this approach, obtain a favorable set of the LDMEs, and manage to reconcile the charmonia production and polarization experiments, except for two sets of CDF data on J/ψ polarization.
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Zhan Sun and Hong-Fei Zhang. Reconciling charmonium production and polarization data in the midrapidity region at hadron colliders within the nonrelativistic QCD framework[J]. Chinese Physics C, 2018, 42(4): 043104. doi: 10.1088/1674-1137/42/4/043104
Zhan Sun and Hong-Fei Zhang. Reconciling charmonium production and polarization data in the midrapidity region at hadron colliders within the nonrelativistic QCD framework[J]. Chinese Physics C, 2018, 42(4): 043104.  doi: 10.1088/1674-1137/42/4/043104 shu
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Received: 2017-11-28
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    Supported by National Natural Science Foundation of China (11405268, 11647113, 11705034)

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Reconciling charmonium production and polarization data in the midrapidity region at hadron colliders within the nonrelativistic QCD framework

    Corresponding author: Hong-Fei Zhang,
  • 1.  School of Science, Guizhou Minzu University, Guiyang 500025, China
  • 2.  Department of Physics, School of Biomedical Engineering, Third Military Medical University, Chongqing 400038, China
Fund Project:  Supported by National Natural Science Foundation of China (11405268, 11647113, 11705034)

Abstract: A thorough study reveals that the only key parameter for ψ (J/ψ, ψ') polarization at hadron colliders is the ratio <Oψ(3S1[8])>/<Oψ(3P0[8])> angle, if the velocity scaling rule holds. A slight variation of this parameter results in substantial change of the ψ polarization. We find that with equally good description of the yield data, this parameter can vary significantly. Fitting the yield data is therefore incapable of determining this parameter, and consequently, of determining the ψ polarization. We provide a universal approach to fixing the long-distance matrix elements (LDMEs) for J/ψ and ψ' production. Further, with the existing data, we implement this approach, obtain a favorable set of the LDMEs, and manage to reconcile the charmonia production and polarization experiments, except for two sets of CDF data on J/ψ polarization.

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