报告人：林子威（East Carolina University）
报告人简介：林子威，East Carolina University 教授。在相对论重离子碰撞过程的输运模型研究与应用方面取得了出色的成果，发表SCI论文六十多篇。其中关于多相输运模型AMPT的单篇文章被引用次数高达七百多次，并被汤姆森路透社科学观察机构选为重离子碰撞物理研究前沿路线图重点文章。林子威教授开发的多相输运模型AMPT也被评为2002年核物理理论研讨会上对于相对论重离子对撞机观测结果预言的“最佳输运模型”。
报告题目：Charm Quarks Are More Hydrodynamic Than Light Quarks
报告摘要：Azimuthal anisotropies such as the elliptic flow v2 are important tools for studying the properties of the quark-gluon plasma. Studies with parton transport models have shown that most parton v2 comes from the anisotropic parton escape, not from the hydrodynamic flow, even for semi-central Au+Au collisions at 200A GeV. Here we use a multi-phase transport (AMPT) model to investigate the flavor dependence of this parton escape mechanism, with the focus on charm quark v2 in heavy ion as well as small system collisions at RHIC and LHC energies. By performing the azimuth-randomized tests, we extract the relative contributions of the escape mechanism to the v2 of light, strange, and charm quarks. We find that the common escape mechanism is at work for both the charm and light quark v2. However, contrary to the naive expectation, we find the charm v2 to be much more sensitive to the hydrodynamic flow than lighter quarks’ v2. This suggests that the charm v2 is a better probe for studying the hydrodynamic properties of the quark-gluon plasma.