Three Particle Lévy HBT from PHENIX

B Kurgyis

doi:10.1134/s1063779620030181

Abstract

Bose-Einstein correlations of identical bosons reveal information about the space-time structure of particle emission from the sQGP formed in ultra-relativistic heavy-ion collisions. Previous measurements of two particle correlations have shown that the source can best be described by a symmetric Levy distribution. Here we report on the measurement of three-particle correlations in 0-30 % centrality Au+Au collisions at $\sqrt{s_{_\text{NN}}} = 200$ GeV, and describe them with a Levy type source. This measurement may shed light on hadron creation mechanisms beyond chaotic emission. We measure three particle correlation strength ($\lambda_3$) as a function of pair transverse momentum. This parameter, combined with two-particle correlation strength $\lambda_2$ may reveal the level of chaoticity and coherence in particle production.

Highlights

Data collected by the PHENIX experiment indicates that this source function is best described by a Levy type source in one dimensional measurements [8], and some preliminary results suggest that this is the case when a three dimensional analysis is performed [9]
From two-particle analyses we can infer the size of the homogeneity region of the source and measure the two particle correlation strength, as well as the Levy exponent [8]
For the visualization of the three dimensional fits, we choose to plot data points and the fitted curve along a diagonal (k12 = k13 = k23) line; this can be seen on Fig. 1. For these fits the Levy scale parameter R and the Levy exponent α was fixed for the values obtained from two pion correlation measurments done on the same dataset [8]

Summary

Introduction

The measurement of Bose-Einstein correlations of identical bosons allows one to map out the femtoscopic geometry of the particle emitting source [1]. Data collected by the PHENIX experiment indicates that this source function is best described by a Levy type source in one dimensional measurements [8], and some preliminary results suggest that this is the case when a three dimensional analysis is performed [9]. From two-particle analyses we can infer the size of the homogeneity region of the source and measure the two particle correlation strength, as well as the Levy exponent [8]. Combining these with three-particle measurements we can explore the nature of particle creation mechanisms in the source [10, 11].

Three-particle femtoscopy with Levy type source

Results

Summary