HBT radii from the multipole Buda-Lund model

TL;DR

This paper extends the Buda-Lund hydrodynamical model to include higher order flow harmonics and azimuthal dependence of HBT radii, enhancing its ability to describe complex asymmetries in heavy-ion collisions.

Contribution

The paper introduces an extension of the Buda-Lund model to incorporate higher order flow harmonics and azimuthal variations of HBT radii.

Findings

Model successfully describes higher order flow harmonics.

Extension captures triangular azimuthal dependence of HBT radii.

Provides a framework for analyzing complex asymmetries.

Abstract

The Buda-Lund model describes an expanding hydrodynamical system with ellipsoidal symmetry and fits the observed elliptic flow and oscillating HBT radii successfully. The ellipsoidal symmetry can be characterized by the second order harmonics of the transverse momentum distribution, and it can be also observed in the azimuthal oscillation of the HBT radii measured versus the second order reaction plane. The model may have to be changed to describe the experimentally indicated higher order asymmetries. In this paper we detail an extension of the Buda-Lund hydro model to investigate higher order flow harmonics and the triangular dependence of the azimuthally sensitive HBT radii.