Measuring charge fluctuations in high-energy nuclear collisions
Measuring charge fluctuations in high-energy nuclear collisions
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DOI：
10.1103/physrevc.66.024904
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发表时间：
2001-12
影响因子：
3.1
通讯作者：
S. Mrówczyński
中科院分区：
文献类型：
--
作者：
S. Mrówczyński
讨论了重离子碰撞中电荷涨落的各种测量方法。的Phi措施的优点进行了论证，并建立其与其他波动措施的关系。为了得到这种关系，Phi通过多重数分布的矩来表示。我们研究了如何采取措施的情况下，一个“背景”模型，代表了经典的强子气体平衡。该模型假设统计粒子的产生受电荷守恒的约束。它还考虑了不完全的实验仪器验收和跟踪效率低下的影响。该模型被证明是近似同意PHENIX和初步的星星数据上的电荷波动。最后，讨论了“无背景”措施。
Various measures of charge fluctuations in heavy-ion collisions are discussed. Advantages of the Phi-measure are demonstrated and its relation to other fluctuation measures is established. To get the relation, Phi is expressed through the moments of multiplicity distribution. We study how the measures act in the case of a `background' model which represents the classical hadron gas in equilibrium. The model assumes statistical particle production constrained by charge conservation. It also takes into account both the effect of incomplete experimental apparatus acceptance and that of tracking inefficiency. The model is shown to approximately agree with the PHENIX and preliminary STAR data on the electric charge fluctuations. Finally, `background-free' measures are discussed.