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

Zhan Sun; Hong-Fei Zhang

doi:10.1088/1674-1137/42/4/043104

Chinese Physics C> 2018, Vol. 42> Issue(4) : 043104 DOI: 10.1088/1674-1137/42/4/043104

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

Zhan Sun ¹ ,
Hong-Fei Zhang ^2,,

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

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Abstract：
A thorough study reveals that the only key parameter for ψ (J/ψ, ψ') polarization at hadron colliders is the ratio <O^ψ(³S₁^[8])>/<O^ψ(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.
- J/ polarization ,
- nonrelativistic QCD ,
- long-distance matrix elements

References

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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

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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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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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

Received Date: 2017-11-28

Available Online: 2018-04-05

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 <O^ψ(³S₁^[8])>/<O^ψ(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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Reconciling charmonium production and polarization data in the midrapidity region at hadron colliders within the nonrelativistic QCD framework

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通讯作者: 陈斌, bchen63@163.com

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