Central Pb+Pb collisions at 158 A GeV/c studied by $\pi^-\pi^-$ interferometry
Central Pb+Pb collisions at 158 A GeV/c studied by $\pi^-\pi^-$ interferometry
复制标题
DOI：
10.1007/s100520000413
复制
发表时间：
2000-03
期刊：
影响因子：
--
通讯作者：
WA98 Collaboration M. M. Aggarwal-WA98-Collaboration-M.-M.-Aggarwal-102809219;E. al.
中科院分区：
文献类型：
--
作者：
WA98 Collaboration M. M. Aggarwal-WA98-Collaboration-M.-M.-Aggarwal-102809219;E. al.
已经测量了从中心 158AGeV Pb+Pb 碰撞中识别出的两粒子相关性，并获得了所有维度上约 7 fm 的拟合半径。提出了半径作为 的函数的多维研究，包括对设备分辨率影响的全面校正。纵向共动系统(LCMS)中标准拟合的交叉项和广义Yano-Koonin拟合的参数与0兼容，表明源经历了升压不变展开。对 和 中相关函数的形状进行了详细分析。它们不是高斯分布，但可以用指数更好地表示。因此，根据用于测量的实验设置的接受程度，将高斯拟合到这些相关函数可能会产生不同的半径。
Two-particle correlations have been measured for identifiedfrom central 158AGeV Pb+Pb collisions and fitted radii of about 7 fm in all dimensions have been obtained. A multi-dimensional study of the radii as a function ofis presented, including a full correction for the resolution effects of the apparatus. The cross termof the standard fit in the Longitudinally CoMoving System (LCMS) and theparameter of the generalised Yano-Koonin fit are compatible with 0, suggesting that the source undergoes a boost invariant expansion.The shapes of the correlation functions inandhave been analyzed in detail. They are not Gaussian but better represented by exponentials. As a consequence, fitting Gaussians to these correlation functions may produce different radii depending on the acceptance of the experimental setup used for the measurement.