Energy Loss of Charm-quark Pair in J/ψ Production From Proton-nucleus Collisions

SONG Lihua; MIAO Wedan; WANG Fengming

doi:10.11804/NuclPhysRev.32.03.291

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Article Navigation > Nuclear Physics Review > 2015 > 32(3): 291-295

SONG Lihua, MIAO Wedan, WANG Fengming. Energy Loss of Charm-quark Pair in J/ψ Production From Proton-nucleus Collisions[J]. Nuclear Physics Review, 2015, 32(3): 291-295. doi: 10.11804/NuclPhysRev.32.03.291

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SONG Lihua, MIAO Wedan, WANG Fengming. Energy Loss of Charm-quark Pair in J/ψ Production From Proton-nucleus Collisions[J]. Nuclear Physics Review, 2015, 32(3): 291-295. doi: 10.11804/NuclPhysRev.32.03.291

Energy Loss of Charm-quark Pair in J/ψ Production From Proton-nucleus Collisions

doi: 10.11804/NuclPhysRev.32.03.291

College of Science, Hebei United University, Tangshan 063009, Hebei, China;

Received Date: 1900-01-01
Rev Recd Date: 1900-01-01
Publish Date: 2015-09-20

Abstract

J/ψ suppression observed in hot nuclear matter from heavy-ion collisions is considered as a most reliable signature for the formation of Quark-Gluon Plasma. The study about the nuclear effects on J/ψ production in cold nuclear matter provides an important tool for clarifying the conventional nuclear suppression mechanism in heavy-ion collisions. J/ψ suppression in p-A collisions is studied by considering the nuclear effects on parton distribution, the energy loss of beam proton in initial state, and the finial state energy loss of c¯c pair.The leading-order computations for J/ψ production cross-section ratios RFe=Be(xF) are presented and compared with the selected E866 experimental data with the J/ψ production occurring outside the nucleus, the obtained energy loss of the color octet is (3.81±1.71) GeV/fm. It is found that the nuclear suppression from the nuclear effects on the parton distribution functions becomes larger as the increase of xF in the range xF > 0，the J/ψ suppression on R_Fe/Be(xF) induced by the energy loss of color octet c¯c is an important nuclear effect, in the region 0:656xF 60:92, the energy loss of beam proton in initial state is the dominant mechanism which causes a reduction of the J/ψ yield.
- J/ψ production,
- charm quark,
- energy loss
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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Energy Loss of Charm-quark Pair in J/ψ Production From Proton-nucleus Collisions

doi: 10.11804/NuclPhysRev.32.03.291

College of Science, Hebei United University, Tangshan 063009, Hebei, China;

Received Date: 1900-01-01
Rev Recd Date: 1900-01-01
Publish Date: 2015-09-20

Key words:

Abstract: J/ψ suppression observed in hot nuclear matter from heavy-ion collisions is considered as a most reliable signature for the formation of Quark-Gluon Plasma. The study about the nuclear effects on J/ψ production in cold nuclear matter provides an important tool for clarifying the conventional nuclear suppression mechanism in heavy-ion collisions. J/ψ suppression in p-A collisions is studied by considering the nuclear effects on parton distribution, the energy loss of beam proton in initial state, and the finial state energy loss of c¯c pair.The leading-order computations for J/ψ production cross-section ratios RFe=Be(xF) are presented and compared with the selected E866 experimental data with the J/ψ production occurring outside the nucleus, the obtained energy loss of the color octet is (3.81±1.71) GeV/fm. It is found that the nuclear suppression from the nuclear effects on the parton distribution functions becomes larger as the increase of xF in the range xF > 0，the J/ψ suppression on R_Fe/Be(xF) induced by the energy loss of color octet c¯c is an important nuclear effect, in the region 0:656xF 60:92, the energy loss of beam proton in initial state is the dominant mechanism which causes a reduction of the J/ψ yield.