New method for measuring azimuthal distributions in nucleus-nucleus collisions

Abstract

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/sqrt(N), 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 to measure 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.

final version (misprints corrected), to be published in Phys.Rev.C

References in corpus (7)

• Transverse momentum analysis of collective motion in relativistic nuclear collisions
• The physics of the centrality dependence of elliptic flow
• Is the analysis of flow at the CERN SPS reliable?
• Recent results from Pb-Au collisions at 158 GeV/c per nucleon obtained with the CERES spectrometer
• Effects of HBT correlations on flow measurements
• Centrality Dependence of Directed and Elliptic Flow at the SPS
• Microscopic study of energy and centrality dependence of transverse collective flow in heavy-ion collisions

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