Explanation of the RHIC HBT Puzzle by a Granular Source of Quark-Gluon Plasma Droplets
Explanation of the RHIC HBT Puzzle by a Granular Source of Quark-Gluon Plasma Droplets
复制标题
DOI：
10.1142/s0218301307009233
复制
发表时间：
2007-02
期刊：
影响因子：
--
通讯作者：
Wei-Ning Zhang;C. Wong
中科院分区：
文献类型：
--
作者：
Wei-Ning Zhang;C. Wong
本文综述了用夸克-胶子等离子体液滴的粒子π介子发射源解释RHIC HBT之谜。液滴的演化是由相对论流体力学描述的状态方程建议的格点规范的结果。颗粒源演化是通过叠加单个液滴的所有演化而获得的。π介子被假定为从处于冻结构型的液滴中热发射，其特征在于冻结温度为T_f。我们发现，平均粒子发射时间尺度与初始半径的液滴。如果液滴半径较小，π介子将更早发射。较早的发射时间将导致较小的提取的HBT半径$R_{\rmout}$，而提取的HBT半径$R_{\rmside}$由液滴中心分布的尺度确定。然而，液滴的集体膨胀可以进一步降低R_{\rm out}$。因此，对于非线性系统，$R_{\rm out}/R_{\rm side}$的值可以接近或甚至小于1。
We present a review on the explanation of the RHIC HBT puzzle by a granular pion-emitting source of quark-gluon plasma droplets. The evolution of the droplet is described by relativistic hydrodynamics with an equation of state suggested by lattice gauge results. The granular source evolution is obtained by superposing all of the evolutions of individual droplets. Pions are assumed to be emitted thermally from the droplets at the freeze-out configuration characterized by a freeze-out temperature $T_f$. We find that the average particle emission time scales with the initial radius of the droplet. Pions will be emitted earlier if the droplet radius is smaller. An earlier emission time will lead to a smaller extracted HBT radius $R_{\rm out}$, while the extracted HBT radius $R_{\rm side}$ is determined by the scale of the distribution of the droplet centers. However, a collective expansion of the droplets can further decrease $R_{\rm out}$. As a result, the value of $R_{\rm out}/R_{\rm side}$ can be close to, or even less than 1 for the