Tubular initial conditions and ridge formation

TL;DR

This paper investigates how initial tubular structures in high-energy nuclear collisions influence the formation of the long-range ridge correlations observed in particle distributions, using hydrodynamic modeling.

Contribution

It demonstrates that multiform initial tubular energy density structures can produce the soft ridge phenomena through hydrodynamic evolution.

Findings

Initial tubular structures significantly affect particle correlations.

Hydrodynamic evolution of tubes can generate ridge-like correlations.

Results align with experimental observations of long-range correlations.

Abstract

The 2D azimuth & rapidity structure of the two-particle correlations in relativistic A+A collisions is altered significantly by the presence of sharp inhomogeneities in superdense matter formed in such processes. The causality constraints enforce one to associate the long-range longitudinal correlations observed in a narrow angular interval, the so-called (soft) ridge, with peculiarities of the initial conditions of collision process. This study's objective is to analyze whether multiform initial tubular structures, undergoing the subsequent hydrodynamic evolution and gradual decoupling, can form the soft ridges. Motivated by the flux-tube scenarios, the initial energy density distribution contains the different numbers of high density tube-like boost-invariant inclusions that form a bumpy structure in the transverse plane. The influence of various structures of such initial conditions in the most central A+A events on the collective evolution of matter, resulting spectra, angular particle correlations and v_n-coefficients is studied in the framework of the HydroKinetic Model (HKM).