Temporal evolution of tubular initial conditions and their influence on two-particle correlations in relativistic nuclear collisions

TL;DR

This paper presents a unified hydrodynamical model explaining two-particle correlation structures in relativistic nuclear collisions through tubular initial conditions, offering insights into initial state effects and potential experimental probes.

Contribution

It introduces a combined model of tubular initial conditions and hydrodynamics to explain correlation structures, contrasting with models based on initial triangularity.

Findings

High energy density tubes produce two-directional particle emission.

Model sensitivity to initial tube parameters offers a potential probe of strong interactions.

Comparison with triangularity-based models highlights different initial condition effects.

Abstract

Relativistic nuclear collisions data on two-particle correlations exhibit structures as function of relative azimuthal angle and rapidity. A unified description of these near-side and away-side structures is proposed for low to moderate transverse momentum. It is based on the combined effect of tubular initial conditions and hydrodynamical expansion. Contrary to expectations, the hydrodynamics solution shows that the high energy density tubes (leftover from the initial particle interactions) give rise to particle emission in two directions and this is what leads to the various structures. This description is sensitive to some of the initial tube parameters and may provide a probe of the strong interaction. This explanation is compared with an alternative one where some triangularity in the initial conditions is assumed. A possible experimental test is suggested.