Effects of momentum conservation on the analysis of anisotropic flow

Abstract

We present a general method for taking into account correlations due to momentum conservation in the analysis of anisotropic flow, either by using the two-particle correlation method or the standard flow vector method. In the latter, the correlation between the particle and the flow vector is either corrected through a redefinition (shift) of the flow vector, or subtracted explicitly from the observed flow coefficient. In addition, momentum conservation contributes to the reaction plane resolution. Momentum conservation mostly affects the first harmonic in azimuthal distributions, i.e., directed flow. It also modifies higher harmonics, for instance elliptic flow, when they are measured with respect to a first harmonic event plane such as one determined with the standard transverse momentum method. Our method is illustrated by application to NA49 data on pion directed flow.

RevTeX 4, 10 pages, 1 eps figure. Version accepted for publication in Phys Rev C

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Cited by in corpus (46)

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• Harmonic decomposition of three-particle azimuthal correlations at RHIC
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• Fluctuation Probes of Early-Time Correlations in Nuclear Collisions
• Momentum conservation and correlation analyses in heavy-ion collisions at ultrarelativistic energies
• Directed and elliptic flow of charged particles in Cu+Cu collisions at $\sqrt{{\mathbf{s}}_{\mathbf{NN}}}=$ 22.4 GeV
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• Review of nonflow estimation methods and uncertainties in relativistic heavy-ion collisions
• A study of the anisotropy associated with dipole asymmetry in heavy ion collisions
• Beam Energy Dependence of Directed and Elliptic Flow Measurement from the STAR Experiment
• Directed flow at RHIC from Lee-Yang zeroes
• Extracting the jet azimuthal anisotropy from higher order cumulants
• Multiparticle azimuthal cumulants from transverse momentum conservation and collective flow
• Multiparticle correlations and momentum conservation in nucleus-nucleus collisions
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• Directed Flow of Charged Kaons in Au+Au Collisions from the BES Program at RHIC
• Effects of the detector non-uniformity in pion directed flow measurement relative to the spectator plane by the NA49 experiment at the CERN SPS
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