Hydrodynamics and perfect fluids: uniform description of soft observables in Au+Au collisions at RHIC

TL;DR

This paper demonstrates that using Gaussian initial energy density profiles in hydrodynamic models provides a more consistent and accurate description of RHIC heavy-ion collision data, potentially solving the longstanding HBT puzzle.

Contribution

It introduces a modified Gaussian initial condition approach that improves the uniformity and accuracy of hydrodynamic descriptions of RHIC data compared to traditional Glauber model initializations.

Findings

Successful reproduction of transverse-momentum spectra

Accurate modeling of v2 and pionic HBT radii

Hints at resolving the RHIC HBT puzzle

Abstract

It is argued that the use of the initial Gaussian energy density profile for hydrodynamics leads to much better uniform description of the RHIC heavy-ion data than the use of the standard initial condition obtained from the Glauber model. With the modified Gaussian initial conditions we successfully reproduce the transverse-momentum spectra, v2, and the pionic HBT radii (including their azimuthal dependence). The emerging consistent picture of hadron production hints that a solution of the long standing RHIC HBT puzzle has been found.