Statistical uncertainties of the harmonics from Q-cumulants
arXiv:2104.00588 · doi:10.1103/PhysRevC.104.034906
Abstract
Analytic formulas to calculate statistical uncertainties of harmonics extracted from the Q-cumulants are presented. The Q-cumulants are multivariate polynomial functions of the weighted means of -particle azimuthal correlations, $\llangle 2m \rrangle$. Variances and covariances of the $\llangle 2m \rrangle$ are included in the analytic formulas of the uncertainties that can be calculated simultaneously with the calculations of the harmonics. The calculations are performed using a simple toy model which roughly simulates elliptic flow azimuthal anisotropy with magnitudes around 0.05. The results are compared with the results obtained by the many data sub-sets, and by the bootstrapping method. The first one is a common way of estimation of the statistical uncertainties of the harmonics in a real experiment. In order to increase precision in the measurement of the harmonics, a large number of 15000 sub-sets and the same number of the re-sampling in the bootstrap method is used. A very good agreement in the comparison with the proposed way of the analytic calculation of the statistical uncertainties is found. Additionally, a recurrence equation for Q-cumulants calculation is also presented.
arXiv comment8 pages, 9 figures
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