Enhanced Production of Delta(1230) and Sigma(1385) Resonances

TL;DR

This paper models the production of Delta(1230) and Sigma(1385) resonances in heavy ion collisions using a kinetic master equation to understand their yields relative to equilibrium conditions.

Contribution

It introduces a kinetic master equation framework to study resonance yields, accounting for initial conditions and freeze-out separation in heavy ion collisions.

Findings

Resonance yields depend on initial hadronization conditions.

Yields can be below or above chemical equilibrium.

The model captures the time evolution of resonances.

Abstract

Yields of Delta(1230), Sigma(1385) resonances produced in heavy ion collisions are studied within the framework of a kinetic master equation. The time evolution is driven by the process Delta(1230) \leftrightarrow N \pi, Sigma(1385) \leftrightarrow \Lambda \pi . We obtain resonance yield both below and above chemical equilibrium, depending on initial hadronization condition and separation of kinetic and chemical freeze-out.