# Thermal-FIST: A package for heavy-ion collisions and hadronic equation of state

## TL;DR

Thermal-FIST is a versatile C++ toolkit for analyzing hadron resonance gas models, enabling detailed studies of particle production, fluctuations, and interactions in heavy-ion collisions with an interactive GUI.

## Contribution

It introduces a comprehensive, user-friendly software package that combines advanced statistical analysis, event generation, and a graphical interface for heavy-ion collision research.

## Key findings

- Supports various statistical ensembles including grand canonical and canonical.
- Includes features for fluctuations, correlations, and hadronic interactions.
- Provides a fast event generator and a graphical user interface.

## Abstract

Thermal-FIST (Thermal, Fast and Interactive Statistical Toolkit) is a C++ package designed for a convenient general-purpose physics analysis within the family of hadron resonance gas (HRG) models. This mainly includes the statistical analysis of particle production in heavy-ion collisions and the phenomenology of hadronic equation of state. Notable features include fluctuations and correlations of conserved charges, effects of probabilistic decay, chemical non-equilibrium, and inclusion of van der Waals hadronic interactions. Calculations are possible within the grand canonical ensemble, the canonical ensemble, as well as in mixed-canonical ensembles combining the canonical treatment of certain conserved charges with the grand-canonical treatment of other conserved charges. The package contains a fast thermal event generator, which generates particle yields in accordance with the HRG chemistry, and particle momenta based on the Blast Wave model. A distinct feature of this package is the presence of the graphical user interface frontend -- QtThermalFIST -- which is designed for fast and convenient general-purpose HRG model applications.