In this paper, the J/ψ nuclear absorption effect is studied at RHIC and LHC energies with the EKS98 shadowing parameterizations. By assuming that the J/ψ absorption cross section, σ abs , increases with the charmonium-nucleon （J/ψ-N） center of mass energy, s J/ψN , it is found that σ abs should depend on x F （or y） at a certain center of mass energy per nucleon pair,s , especially at LHC energies. The theoretical results with the x F （or y）-dependence of the absorption effect are in good agreement with the experiment data from PHENIX in d-Au collisions and the predicted results will be examined by the forthcoming experimental data from LHC in d-Pb collisions. Finally, we also present baseline calculations of cold nuclear matter effects on J/ψ production in nucleus-nucleus （A-A） collisions and find that the x F （or y）-dependence of absorption effect is very small at both RHIC and LHC energies in A-A collisions.
In a Glauber Monte Carlo framework, taking into account the transverse spatial distribution of hard partons in the nudeon, we analyze the nuclear modification factor RdAu for J/φ in d＋Au collisions with EPS09 shadowing parametrization. After the influence of nucleon hard partons distribution is considered, a clearly upward correction is revealed for the dependence of RdAu on Neon in peripheral d＋Au collisions, however, an unconspicuous correction is shown for the results versus PT. The theoretical results are in good agreement with the experimental data from PHENIX.
By means of the AKK08 fragmentation function, the net-proton transverse momentum （pT） spectra in A＋A collisions are studied with two phenomenological models based on the Color Glass Condensate formalism. After a χ2 analysis of the experimental data from BRAHMS, the normalization constant C is extracted at RHIC energies of √sNN =62.4 and 200 GeV, and the theoretical results of the net-proton pT spectra at selected rapidities are also given. It is shown that the theoretical results are in good agreement with the experimental data. Finally, assuming the constant C should have an exponent dependence of √sNN, we also predict the theoretical results of net-proton pT spectra at LHC energies of √sNN = 2.76, 3.94, and 5.52 TeV.
利用美国相对论重离子对撞机（Relativistic Heavy Ion Collider，RHIC）提供的质子-质子碰撞中J／ψ产生随快度变化的最新实验数据，抽取了快度在作为随机变量时的概率分布密度函数，在建立的Glauber蒙特卡罗模型中研究了氘-金碰撞中J／ψ粒子产生的大横动量现象。经计算发现：在考虑到核遮蔽效应和核吸收效应后，理论结果能很好地解释最新实验现象。
