Statistical Ensembles With Finite Bath: A Description for an Event Generator

TL;DR

This paper introduces a Monte Carlo event generator that uses a re-weighting scheme to incorporate conservation laws, enabling efficient simulation of hadronic systems with large sizes and resonance decays.

Contribution

It presents a novel re-weighting approach to extend grand canonical Monte Carlo results to the microcanonical limit, handling resonance decays and large systems effectively.

Findings

Effective re-weighting scheme for conservation laws

Handles resonance decays in large systems

Extends grand canonical results to microcanonical limit

Abstract

A Monte Carlo event generator has been developed assuming thermal production of hadrons. The system under consideration is sampled grand canonically in the Boltzmann approximation. A re-weighting scheme is then introduced to account for conservation of charges (baryon number, strangeness, electric charge) and energy and momentum, effectively allowing for extrapolation of grand canonical results to the microcanonical limit. This method has two strong advantages compared to analytical approaches and standard microcanonical Monte Carlo techniques, in that it is capable of handling resonance decays as well as (very) large system sizes.