GLISSANDO: GLauber Initial-State Simulation AND mOre

TL;DR

GLISSANDO is a C++ Monte Carlo generator for simulating initial conditions in relativistic heavy-ion collisions, incorporating various models and distributions to aid in analyzing phenomena like jet quenching and flow fluctuations.

Contribution

It introduces a flexible Glauber Monte Carlo framework with multiple models and detailed source distributions for initial-state simulations in heavy-ion physics.

Findings

Provides detailed source density profiles for collision analysis

Includes models for hot-spots and statistical dispersion

Supports proton-nucleus and deuteron-nucleus collision simulations

Abstract

GLISSANDO is a Glauber Monte-Carlo generator for early-stages of relativistic heavy-ion collisions, written in c++ and interfaced to Root. Several models are implemented: the wounded-nucleon model, the binary collisions model, the mixed model, and the model with hot-spots. Subtleties of the distribution of nucleon in the nucleus are discussed. The original geometric distribution of sources in the transverse plane can be superimposed with a statistical distribution simulating the dispersion in the generated transverse energy in each individual collision. The program generates inter alia the fixed axes (standard) and variable-axes (participant) two-dimensional profiles of the density of sources in the transverse plane and their Fourier components. These profiles can be used in further analyses of physical phenomena, such as the the jet quenching, event-by-event hydrodynamics, or analysis of the elliptic flow and its fluctuations. Characteristics of the event (multiplicities, eccentricities, Fourier coefficients, etc.) are evaluated and stored in a file for further off-line studies. A number of scripts is provided for that purpose. Supplied variants of the code can also be used for the proton-nucleus and deuteron-nucleus collisions.