Energy loss effect of incoming gluons from J/ψ production in p-A collisions

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Li-Hua Song, Lin-Wan Yan and Chun-Gui Duan. Energy loss effect of incoming gluons from J/ψ production in p-A collisions[J]. Chinese Physics C, 2017, 41(2): 023102. doi: 10.1088/1674-1137/41/2/023102
Li-Hua Song, Lin-Wan Yan and Chun-Gui Duan. Energy loss effect of incoming gluons from J/ψ production in p-A collisions[J]. Chinese Physics C, 2017, 41(2): 023102.  doi: 10.1088/1674-1137/41/2/023102 shu
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Received: 2016-09-02
Revised: 2016-10-11
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    Supported by National Natural Science Foundation of China (11405043, 11575052)

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Energy loss effect of incoming gluons from J/ψ production in p-A collisions

    Corresponding author: Li-Hua Song,
  • 1.  College of Science, North China University of Science and Technology, Tangshan 063009, China
  • 2.  Department of Physics, Hebei Normal University, Shijiazhuang 050024, China
Fund Project:  Supported by National Natural Science Foundation of China (11405043, 11575052)

Abstract: The energy loss effect of incoming gluons from J/ψ production in p-A (or d-A) collisions is investigated by means of the E866, RHIC and LHC experimental data. The gluon mean energy loss per unit path length dE/dL=2.18±0.14 GeV/fm is extracted by fitting the E866 experimental data for J/ψ production cross section ratios RW(Fe)/Be(xF). The obtained result indicates that the incoming gluons lose more energy than the incident quarks. By comparing the theoretical results with E866, RHIC, and LHC experimental data, it is found that the nuclear suppression due to the incident gluon (quark) energy loss reduces (increases) with the increase of the kinematic variable xF (or y). The energy loss effect of incoming gluons plays an important role in the suppression of J/ψ production in a wide energy range from √s=38.7 GeV to √s=5.0 TeV, and the influence of incident quark energy loss can be ignored for high energies (such as at RHIC and LHC energy).

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