Pion Interferometry for a Granular Source of Quark-Gluon Plasma Droplets
Pion Interferometry for a Granular Source of Quark-Gluon Plasma Droplets
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DOI：
10.1103/physrevc.70.024903
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发表时间：
2004-08
影响因子：
3.1
通讯作者：
W. Zhang;M. J. Efaaf;Cheuk-Yin Wong Harbin Institute of Technology;Harbin;P.R.China.;Oak Ridge National Laboratory;Oak Ridge;U.S.A.;U. Tennessee;Knoxville
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文献类型：
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作者：
W. Zhang;M. J. Efaaf;Cheuk-Yin Wong Harbin Institute of Technology;Harbin;P.R.China.;Oak Ridge National Laboratory;Oak Ridge;U.S.A.;U. Tennessee;Knoxville
我们研究了夸克-胶子等离子体液滴颗粒源的2 π干涉。液滴的演化由相对论流体力学描述，状态方程由格点规范结果建议。π介子被假定为热发射的冻结出配置的冻结出温度Tf为特征的液滴。我们发现，HBT半径Rout减小，如果初始尺寸的液滴减小。另一方面，Rside取决于液滴的空间分布，并且与液滴尺寸相对独立。随着液滴空间分布宽度的增大和液滴集体膨胀速度的增大，液滴扩散系数增大。因此，对于颗粒夸克胶子等离子体源，Rout的值可以接近Rside。发射源的颗粒模型可能为RHIC HBT之谜提供一个解释，并可能导致对夸克-胶子等离子体相变动力学的新见解。
We examine the two-pion interferometry for a granular source of quark-gluon plasma droplets. The evolution of the droplets is described by relativistic hydrodynamics with an equation of state suggested by lattice gauge results. Pions are assumed to be emitted thermally from the droplets at the freeze-out configuration characterized by a freeze-out temperature Tf. We find that the HBT radius Rout decreases if the initial size of the droplets decreases. On the other hand, Rside depends on the droplet spatial distribution and is relatively independent of the droplet size. It increases with an increase in the width of the spatial distribution and the collective-expansion velocity of the droplets. As a result, the value of Rout can lie close to Rside for a granular quark-gluon plasma source. The granular model of the emitting source may provide an explanation to the RHIC HBT puzzle and may lead to a new insight into the dynamics of the quark-gluon plasma phase transition.