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arXiv 0912.4498hep-phhep-exnucl-exnucl-th
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sqrt(s_NN)=200 GeV时d+Au、Cu+Cu和Au+Au碰撞中冷核物质对J/Psi产生的影响

Centrality, Rapidity and Transverse-Momentum Dependence of Cold Nuclear Matter Effects on J/Psi Production in d+Au, Cu+Cu and Au+Au Collisions at sqrt(s_NN)=200 GeV

E. G. Ferreiro, F. Fleuret, J. P. Lansberg, A. Rakotozafindrabe

摘要:

我们在sqrt(s_NN)=200 GeV的d+Au,Cu+Cu和Au+Au碰撞中,对冷核物质(CNM)对J/Psi产生的影响进行了广泛的研究。我们研究了三种不同的胶子阴影参数化的影响,使用了通常的简化运动学,其中忽略了胶子反冲J/Psi的动量,以及2 -> 2过程的精确运动学,即g+g -> J/psi+g,正如从LO pQCD所预期的那样。我们指出,无论采用哪种遮蔽参数化,核修正因子R_dAu的快度分布,特别是它的反遮蔽峰,在2 -> 2运动学中系统地向大快度方向移动。反过来,我们也注意到了有效终态核吸收的差异,这是拟合PHENIX d+Au数据所必需的。利用我们对2 -> 2运动学的实现,我们还计算了后者核修饰因子的横向动量依赖性,这无法用通常的简化运动学来预测。计算了Cu+Cu和Au+Au碰撞的所有相应观测量,并与PHENIX和STAR数据进行了比较。最后,我们从PHENIX合作组最近对d+Au中R_CP的测量中提取了有效核吸收。

英文摘要:

We have carried out a wide study of Cold Nuclear Matter (CNM) effects on J/Psi production in d+Au, Cu+Cu and Au+Au collisions at sqrt(s_NN)=200 GeV. We have studied the effects of three different gluon-shadowing parametrisations, using the usual simplified kinematics for which the momentum of the gluon recoiling against the J/Psi is neglected as well as an exact kinematics for a 2 -> 2 process, namely g+g -> J/psi+g as expected from LO pQCD. We have shown that the rapidity distribution of the nuclear modification factor R_dAu, and particularly its anti-shadowing peak, is systematically shifted toward larger rapidities in the 2 -> 2 kinematics, irrespective of which shadowing parametrisation is used. In turn, we have noted differences in the effective final-state nuclear absorption necessary to fit the PHENIX d+Au data. Taking advantage of our implementation of a 2 -> 2 kinematics, we have also computed the transverse momentum dependence of the latter nuclear modification factor, which cannot be predicted with the usual simplified kinematics. All the corresponding observables have been computed for Cu+Cu and Au+Au collisions and compared to the PHENIX and STAR data. Finally, we have extracted the effective nuclear absorption from the recent measurements of R_CP in d+Au by the PHENIX collaboration.

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