Spectra, elliptic flow and azimuthally sensitive HBT radii from Buda-Lund model for sqrt(s(NN)) = 200 GeV Au+Au collisions

TL;DR

This paper extends the Buda-Lund hydrodynamic model to include elliptic flow and azimuthal correlations, successfully fitting RHIC data to reveal anisotropic expansion in high-energy nuclear collisions.

Contribution

It introduces an ellipsoidally symmetric version of the Buda-Lund model to describe azimuthal dependencies in heavy-ion collisions, providing new insights into the shape and flow dynamics.

Findings

Transverse flow is faster in the reaction plane than out of plane.

Reaction zone is slightly more elongated in-plane.

Model fits align well with RHIC data.

Abstract

We present calculations of elliptic flow and azimuthal dependence of correlation radii in the ellipsoidally symmetric generalization of the Buda-Lund hydrodynamic model of hadron production in high-energy nuclear collisions. We compare them to data from RHIC by simultaneous fits to azimuthally integrated invariant spectra of pions, kaons and protons-antiprotons measured by PHENIX in Au+Au reactions at center of mass energy of 200 AGeV. STAR data were used for azimuthally sensitive two-particle correlation function radii and for the transverse momentum dependence of the elliptic flow parameter v2. We have found that the transverse flow is faster in the reaction plane then out of plane, which results in a reaction zone that gets slightly more elongated in-plane than out of plane. The model parameters extracted from the fits are shown and discussed.