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A modified explanation of cold nuclear matter effects on J/ψ production in p+A collisions

Chinese Physics C 2015年第8期39卷 56-61页

作者：刘植凤 Institute of Geophysics Shijiazhuang Economic University

A modified explanation of the cold nuclear matter （CNM） effects on J/ψ production in p＋A collisions is presented in this paper. The advantage of the modified explanation is that all the CNM effects implemented in this model have clear physical origins and are mostly centered on the idea of multiple parton scattering. With the CNM effects presented in this paper, we calculated the nuclear modification factor RpA in J/ψ production under different collision energies. The results are compared with the corresponding experiment data and the factors calculated with classic nuclear effects. The factors calculated with CNM effects presented in this paper can accurately reproduce almost all existing J/ψ measurements in p-A collisions, which is much better than results obtained with the factors calculated with classic nuclear effects. The new model is therefore a more suitable approach to explain CNM effects in the hardproduction of quarkonium.

关键词： quantum chromodynamics cold nuclear matter effects quark energy loss effect dynamical shadowingeffect gluon saturation

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Drell-Yan dilepton production in relativistic heavy-ion collisions at RHIC

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Chinese Physics C 2011年第9期35卷 829-832页

作者：冯秀梅张本威 College of Physics Science & Technology Central China Normal University Key Laboratory of Quark & Lepton Physics(Central China Normal University) Ministry of Education

We investigate the lepton pair production with the Drell-Yan process in relativistic heavy ion collisions by computing the double differential cross section dσ/dM2dy and dσ/dM2dxF at the next-to-leading order in p＋Au and Au＋Au collisions with √SNN = 200 GeV at RHIC. The resulting nuclear modification factors RpAu and RAuAu show strong sensitivity to the cold nuclear matter （CNM） effects and could probe the CNM effects at a very wide region of the longitudinal momentum fraction x. The variation of R with the invariant mass M, the rapidity y and the Feynman variable XF is shown and we find that the nuclear modification factor for the double differential cross section could be smaller than 0.4 in some kinematic regions of high-energy nucleus-nucleus reactions at RHIC.

关键词： Drell-Yan process heavy-ion collisions cold nuclear matter effects

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