Minimizing statistical and systematic bias in transverse momentum correlations for relativistic heavy-ion collisions

被引:3
作者
Ray, R. L. [1 ]
Bhattarai, P. [1 ]
机构
[1] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA
关键词
AU-AU COLLISIONS; FLUCTUATION SCALE DEPENDENCE; PB-PB COLLISIONS; MEAN-P(T) FLUCTUATIONS; CENTRALITY DEPENDENCE; ANGULAR-CORRELATIONS; ELLIPTIC FLOW; P(T); ENERGY; AUTOCORRELATIONS;
D O I
10.1103/PhysRevC.94.064902
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
Two-particle correlation measurements and analysis are an important component of the relativistic heavy-ion physics program. In particular, particle pair-number correlations on two-dimensional transverse momentum (p(t)) allow unique access to soft, semihard, and hard scattering processes in these collisions. Precise measurements of this type of correlation are essential for understanding the dynamics in heavy-ion collisions. However, transverse momentum correlation measurements are especially vulnerable to statistical and systematic biases. In this paper the origins of these large bias effects are explained and mathematical correlation forms are derived from mean-pt fluctuation quantities in the literature. Monte Carlo simulations are then used to determine the conditions, e. g., multiplicity and collision centrality bin widths, where each correlation form is minimally biased. The ranges of applicability for each correlation quantity are compared. Several are found to reproduce the assumed input correlations with reasonable fidelity over a wide range of conditions encountered in practical analysis of data.
引用
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页数:21
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