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Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
Phys Rev Lett. 2004 Oct 8;93(15):152302. doi: 10.1103/PhysRevLett.93.152302.
Bose-Einstein correlations of identically charged pion pairs were measured by the PHENIX experiment at midrapidity in Au + Au collisions at square root s(NN)=200 GeV. The Bertsch-Pratt radius parameters were determined as a function of the transverse momentum of the pair and as a function of the centrality of the collision. Using the standard core-halo partial Coulomb fits, and a new parametrization which constrains the Coulomb fraction as determined from the unlike-sign pion correlation, the ratio R(out)/R(side) is within 0.8-1.1 for 0.25< <k(T)> <1.2 GeV/c. The centrality dependence of all radii is well described by a linear scaling in N(1/3)(part), and R(out)/R(side) for <k(T)> approximately 0.45 GeV/c is approximately constant at unity as a function of centrality.
在(\sqrt{s_{NN}} = 200)GeV的金离子与金离子碰撞中，PHENIX实验在中快度区域测量了同电荷π介子对的玻色 - 爱因斯坦关联。确定了贝奇 - 普拉特半径参数作为介子对横向动量的函数以及碰撞中心度的函数。使用标准的核心 - 晕部分库仑拟合，以及一种新的参数化方法（该方法根据异号π介子关联确定的库仑分数进行约束），对于(0.25 < \langle k_T\rangle < 1.2)GeV/c，(R_{out}/R_{side})在0.8 - 1.1范围内。所有半径的中心度依赖性都可以通过(N_{part}^{1/3})中的线性标度很好地描述，并且对于(\langle k_T\rangle\approx0.45)GeV/c，(R_{out}/R_{side})作为中心度的函数在约为1时近似恒定。
