相对论重离子碰撞中π对相对动量分布

Distributions of Realative Momentum of Pion Pairs in Relativistic Heavy Ion Collisions

在π源动量分布的高斯分布下，给出了相对论重离子碰撞中非关联π对和关联π对的相对动量分布．用关联π对的相对动量分布得到球形高斯分布π源参数与椭球形高斯分布π源参数的解析关系，与相对论重离子中心碰撞１．８ＡＧｅＶ Ａｒ＋Ｐｂ的实验结果进行了对比．当π源温度更高时，应当用 ｐ１（ｐ）＝Ｎ·ｅｘｐ（－ｍ２＋ｐ２／Ｔ）进行计算．

The distributions of the relative momentum of correlated and uncorrelated pion pairs are given. The relations between the parameters of elliptical and spherical pion sources are obained by using the distribution of the relative momentum of correlated pion pairs, and comparison is made with the experimental result of central relativistic heavy ion collisions 1. 8A GeV Ar + Pb. For higher tem- perature, the distribution of single-pion momentum p1 (p ) = N· exp(- m2+p2/T) should be used to obtain the results.