RHIC到LHC能区重离子碰撞中大横动量区域各向异性的研究

项目名称： RHIC到LHC能区重离子碰撞中大横动量区域各向异性的研究

项目编号： No.11347005

项目类型： 专项基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 陈晓芳

作者单位： 江苏师范大学

项目金额： 20万元

中文摘要： 高能重离子碰撞物理研究的中心目的之一就是理解碰撞形成的强耦合夸克胶子等离子体（sQGP）介质的属性。其中一个重要现象就是大横动量喷注在介质中损失能量而导致的喷注淬火或者强子产额的压低现象，这种压低已经在RHIC实验的多项测量得到证实。然而RHIC和LHC实验大横动量区域产生粒子的方位角各向异性的测量却对喷注淬火的微扰QCD（PQCD）描述提出了挑战。理论计算与实验数据的矛盾暗示着当前的PQCD模型需要进一步调整。因此在本项目中，我们将利用次领头阶（NLO）PQCD部分子模型，深入研究QGP介质的形成时间、介质初态涨落效应、在临界温度Tc附近能量损失对能量密度的非线性依赖以及能量损失对路径长度的更高次方依赖等因素对大横动量各向异性产生的影响。这些研究将有助于我们理解喷注和流介质之间相互作用的一些新特征和规律，为高能重离子碰撞中喷注淬火理论提供更严格的限制。

中文关键词： 喷注淬火；各向异性；部分子模型；谷劈裂；磁耦合

英文摘要： A central goal of high-energy heavy-ion collider physics is to understand the properties of strongly -coupled Quark Gluon Plasma(sQGP), formed at the Relativistic Heavy Ion Collider(RHIC). An important tool for this goal is jet quenching or the suppression of high transverse momentum (pT) hadron yields as a result of in-medium energy loss of high pT jets. Such suppression was firmly demonstrated in many measurements of RHIC experiment. However one of challenges to the pQCD description of jet quenching come from the measurement of high-pT azimuthal anisotropy for particles emitted relative to the reaction plane in heavy-ion collision at RHIC and LHC. This discrepancy implies that the current pQCD models need further tuning. Thus in this proposal, we will use NLO PQCD parton model, further study the influences of several points, including formation time of sQGP medium, the fluctuation of initial state, the nolinear dependence of energy loss on the energy density at Tc and the high-power dependence of energy loss on path length. These studies can provide us a new insight on jet-medium interaction and a better constrain on jet quenching theory in high energy heavy-ion collisions.

英文关键词： jet quenching；azimuthal anisotropy；parton model；valley splitting；magnetic coupling