Hadron rapidity spectra within a hybrid model

TL;DR

This paper introduces a hybrid model combining string dynamics and hydrodynamics to simulate heavy-ion collisions, effectively describing proton spectra but needing improvements for pion distributions.

Contribution

The paper presents a novel two-stage hybrid model integrating hadron string dynamics with ideal hydrodynamics for heavy-ion collision analysis.

Findings

Reasonable agreement with proton rapidity spectra data.

Inability to accurately reproduce pion rapidity distributions.

Highlights need for viscosity effects in hydrodynamical modeling.

Abstract

A 2-stage hybrid model is proposed that joins the fast initial state of interaction, described by the hadron string dynamics (HSD) model, to subsequent evolution of the expanding system at the second stage, treated within ideal hydrodynamics. The developed hybrid model is assigned to describe heavy-ion collisions in the energy range of the NICA collider under construction in Dubna. Generally, the model is in reasonable agreement with the available data on proton rapidity spectra. However, reproducing proton rapidity spectra, our hybrid model cannot describe the rapidity distributions of pions. The model should be improved by taking into consideration viscosity effects at the hydrodynamical stage of system evolution.