arXiv 1109.53372011-09-25hep-ph

质子-核碰撞中J/π产生的核效应

Nuclear effects on J/ψ production in proton-nucleus collisions

Chun-Gui Duan, Jian-Chao Xu, Li-Hua Song

发表信息：: Eur.Phys.J.C67:173-179,2010
DOI：: 10.1140/epjc/s10052-010-1270-1

摘要：

研究质子-核碰撞中J/π产生的核效应对于正确解释重离子碰撞中J/π抑制的实验结果至关重要。在统一的Glauber模型框架下，利用三组有代表性的核部分子分布，考虑了初态的能量损失效应和末态的核吸收效应。对E866实验数据进行了J/Xe产生截面比RW/Be（xF）的首阶唯象分析。定量研究了不同核效应对J/ψ的抑制作用。结果表明，在高xF区，能量损失效应对RW/Be（xF）的抑制比核效应对部分子分布的影响更重要。在小xF的E866数据保持了核胶子分布与一个大的反遮蔽效应。然而，新的HERA-B测量不支持核胶子分布中的反遮蔽效应。发现J/π-核子非弹性截面σ J/π abs依赖于运动学变量xF，在xF > 0.2的区域内随xF的增大而增大. 1引言

英文摘要：

The study of nuclear effects for J/ψ production in proton-nucleus collisions is crucial for a correct interpretation of the J/ψ suppression patterns experimentally observed in heavy-ion collisions. By means of three representative sets of nuclear parton distribution, the energy loss effect in the initial state and the nuclear absorption effect in the final state are taken into account in the uniform framework of the Glauber model. A leading order phenomenological analysis is performed on J/ψ production cross-section ratios RW/Be(xF) for the E866 experimental data. The J/ψ suppression is investigated quantitatively due to the different nuclear effects. It is shown that the energy loss effect with resulting in the suppression on RW/Be(xF) is more important than the nuclear effects on parton distributions in high xF region. The E866 data in the small xF keep out the nuclear gluon distribution with a large anti-shadowing effect. However, the new HERA-B measurement is not in support of the anti-shadowing effect in the nuclear gluon distribution. It is found that the J/ψ-nucleon inelastic cross section σ J/ψ abs depends on the kinematical variable xF, and increases as xF in the region xF > 0.2. 1 Introduction

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