Energy Loss of Charm-quark Pair in J/ψ Production From Proton-nucleus Collisions
doi: 10.11804/NuclPhysRev.32.03.291
- Received Date: 1900-01-01
- Rev Recd Date: 1900-01-01
- Publish Date: 2015-09-20
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Key words:
- J/ψ production /
- charm quark /
- energy loss
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 RFe/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.
Citation: | 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 |