Hard QCD Processes in Relativistic Heavy Ion Collisions

该项目旨在改进硬QCD过程的理论描述，硬QCD过程是CERN SPS、布鲁克海文实验室RHIC和即将到来的核子对撞机LHC重离子碰撞实验项目的重要组成部分。硬反应被用来探测由重离子碰撞产生的物质。这项任务需要对潜在的动态有可靠的理解。根据我们以前的经验，我们将研究：(i)大pT强子产生中的初始态效应。在LHC的能量下，这些探针受到相干效应的强烈影响，相干效应在RHIC中具有中等重要性，在SPS中几乎不可见。一种能够描述高pT强子的现有数据的现象学，包括风味依赖，将被开发；（ii）高铂强子生产中的末态相互作用。拟建立一个包含有限生产长度效应的中等强子化模型，并用核深非弹性散射数据进行验证；（iii）最近从重离子重离子重离子碰撞中产生重味的结果表明，缺乏对这些过程中初始状态相互作用动力学的理解。建立了一个能够描述从SPS到RHIC的宽能量范围内J/q， D快速依赖的模型。

This project is aimed at an improvement of theoretical description of hard QCD processes which are an important part of the experimental program on heavy ion collisions at CERN SPS, RHIC at Brookhaven Lab, and at the forthcoming nuclear collider LHC at CERN. Hard reactions are employed as a probe for the matter produced by colliding heavy ions. This task demands a reliable understanding of the underlying dynamics. Based on our previous experience we are going to work on: (i) Initial state effects in hadron production with large pT. At the energy of LHC these probes are strongly affected by coherence effects which are of moderate importance at RHIC and hardly visible at SPS. A phenomenology able to describe available data for high pT hadrons including flavor dependence is to be developed; (ii) Final state interaction in high-pT hadron production. A realistic model for in-medium hadronization including the finite production length effects is to be developed and tested with data on deep-inelastic scattering off nuclei; (iii) The recent results from RHIC for heavy flavor production in deuteron-gold collisions have demonstrated lack of understanding of the dynamics of initial state interactions in these processes. A model able to describe J/q, D rapidity dependence in an wide energy range from SPS to RHIC will be developed.