New method for measuring azimuthal distributions in nucleus-nucleus collisions

被引：241

作者：

Borghini, N

Dinh, PM

Ollitrault, JY

机构：

[1] Univ Paris 06, Lab Phys Theor Particules Elementaires, F-75252 Paris 05, France

[2] CEA Saclay, Serv Phys Theor, F-91191 Gif Sur Yvette, France

来源：

PHYSICAL REVIEW C | 2001年 / 63卷 / 05期

关键词：

D O I：

10.1103/PhysRevC.63.054906

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：

The methods currently used to measure azimuthal distributions of particles in heavy-ion collisions assume that all azimuthal correlations between particles result from their correlation with the reaction plane. However, other correlations exist. and it is safe to neglect them only if azimuthal anisotropies are much larger than 1/rootN, with N the total number of particles emitted in the collision. This condition is not satisfied at ultrarelativistic energies. We propose a new method, based on a cumulant expansion of multiparticle azimuthal correlations. which allows measurements of much smaller values of azimuthal anisotropies. down to 1/N. It is simple to implement and can be used to measure both integrated and differential flow. Furthermore. this method automatically eliminates the major systematic errors, which are due to azimuthal asymmetries in the detector acceptance.

引用

页码：549061 / 5490626

页数：26

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