Hadronic dissipative effects on elliptic flow in ultrarelativistic heavy-ion collisions
Hadronic dissipative effects on elliptic flow in ultrarelativistic heavy-ion collisions
复制标题
DOI：
10.1016/j.physletb.2006.03.060
复制
发表时间：
2005-11
影响因子：
4.4
通讯作者：
Tetsufumi Hirano;U. Heinz;D. Kharzeev;R. Lacey;Y. Nara
中科院分区：
文献类型：
--
作者：
Tetsufumi Hirano;U. Heinz;D. Kharzeev;R. Lacey;Y. Nara
研究了s= 200 AGeV Au+Au碰撞中椭圆流系数v2（η，B）随赝快度η和碰撞参数B的变化.使用一种混合的方法，结合早期的理想流体动力学演化与晚期的强子再散射，我们证明了强耗散效应的强子再散射阶段的椭圆流。与Glauber模型的初始条件，强子耗散被证明是足够的，以充分解释测量的v2值和理想的流体动力学预测之间的差异。初始条件的基础上的彩色玻璃凝聚模型产生更大的椭圆流，似乎需要额外的耗散在早期的夸克胶子等离子体阶段，以实现与实验一致。
We study the elliptic flow coefficient v2(η,b) in Au+Au collisions at s=200A GeV as a function of pseudorapidity η and impact parameter b. Using a hybrid approach which combines early ideal fluid dynamical evolution with late hadronic rescattering, we demonstrate strong dissipative effects from the hadronic rescattering stage on the elliptic flow. With Glauber model initial conditions, hadronic dissipation is shown to be sufficient to fully explain the differences between measured v2values and ideal hydrodynamic predictions. Initial conditions based on the Color Glass Condensate model generate larger elliptic flow and seem to require additional dissipation during the early quark–gluon plasma stage in order to achieve agreement with experiment.