Utilizing the maximum likelihood estimator for flow analysis

Chong Ye

doi:10.1103/PhysRevC.108.024901

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Utilizing the maximum likelihood estimator for flow analysis

2023-08-01

DOI：10.1103/PhysRevC.108.024901

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Abstract

En 中文

We explore the possibility of evaluating flow harmonics by employing the maximum likelihood estimator (MLE). For a given finite multiplicity, the MLE simultaneously furnishes estimations for all the parameters of the underlying distribution function while efficiently suppressing the variance of measures. Also, the method provides a means to assess a specific class of mixed harmonics, which is not straightforwardly feasible by the approaches primarily based on particle correlations. The results are analyzed using the Wald, likelihood ratio, and score tests of hypotheses. Besides, the resultant flow harmonics obtained using MLE are compared with those derived using particle correlations and event plane methods. The dependencies of extracted flow harmonics on the multiplicity of individual events and the total number of events are analyzed. It is shown that the proposed approach works efficiently to deal with the deficiency in detector acceptability. Moreover, we elaborate on a fictitious scenario where the event plane is not a well-defined quantity in the distribution function. For the latter case, the MLE is shown to largely perform better than the two-particle correlation estimator. In this regard, one concludes that the MLE furnishes a meaningful alternative to the existing approaches for flow analysis.

Keywords:

ELLIPTIC-FLOW

HYDRODYNAMIC RESPONSE

ANISOTROPIC FLOW

COLLECTIVE FLOW

COLLISIONS

DEPENDENCE

ENERGY

Journal

Physical Review C

IF:

3.4

Papers:

2.9W

Citations:

5.7W

Organization

Universidade Federal do Rio de Janeiro

Scholars:

2.9W

Papers: 1.8W

Citations: 1.6W

Yangzhou University

Scholars:

2.8W

Papers: 1.9W

Citations: 3.3W

universidade de sao paulo

Scholars:

10.6W

Papers: 6.7W

Citations: 93

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