【摘要】 利用ＣＥＲＮＮＡ２７合作组提供的ＬＥＢＣ泡室照片，测量了４００ＧｅＶ／ｃＰＰ碰撞产生的带电粒子赝快度分布．计算了标度阶乘累积矩Ｋｑ，与具有同样单粒子谱但是没有关联的蒙特卡罗事例得到的结果相比较，表明对于宽的混合多重数分布，Ｋ２的一个显著部分是由于多重数涨落引起单粒子密度涨落造成的．利用星形关联积分法计算得到的阶乘累积矩，显著地降低了高阶阶乘累积矩的统计误差，但基本结论保持不变．更多还原

【Abstract】 The pseudorapidity distribution of charged particles produced in pp collisions at 400GeV/c was measured by using LEBC films offered by CERN NA27 collaboration. The scaled factorial cumulant moments have been caloulated. Comparing with the results obtained from Monte Carlo events with the same single particle spectrum and no correlations, it is shown that for broad mixed multiplicity distributions, a significant part of K2 is coming from the single particle fluctuation due to the fluctuating multiplicity. The factorial cumulant moments obtained by using the star correlation integrals reduce significantly the statistical errors of the higher order cumulant moments, but the essential conclusions remain unchanged.更多还原