Event plane resolution correction for azimuthal anisotropy in wide centrality bins

TL;DR

This paper introduces a correction method for azimuthal anisotropy measurements in heavy-ion collisions, improving accuracy across wide centrality bins, especially for rare particles, by addressing biases in existing techniques.

Contribution

A new correction procedure for azimuthal anisotropy that reduces bias in wide centrality bins, aiding measurements of rare particles.

Findings

Existing methods have up to 15% bias.

The new method reduces bias in anisotropy measurements.

Applicable to rare particle analysis in heavy-ion collisions.

Abstract

We provide a method to correct the observed azimuthal anisotropy in heavy-ion collisions for the event plane resolution in a wide centrality bin. This new procedure is especially useful for rare particles, such as Omega baryons and J/psi mesons, which are difficult to measure in small intervals of centrality. Based on a Monte Carlo calculation with simulated v_2 and multiplicity, we show that some of the commonly used methods have a bias of up to 15%.