Continuous Decoupling of Dynamically Expanding Systems

TL;DR

This paper introduces a smooth, semi-classical decoupling model for expanding systems, improving upon instantaneous freeze-out assumptions, with implications for high-energy nuclear collision phenomena.

Contribution

It develops a generalized decoupling formula that models continuous freeze-out in expanding systems, bridging the gap between instantaneous and gradual decoupling approaches.

Findings

Provides a smooth decoupling framework for single and two-particle spectra

Establishes relations between damping width and decoupling duration

Discusses implications for hadronic matter in nuclear collisions

Abstract

The question of decoupling and freeze-out is reinvestigated and analysed in terms of transparent semi-classical decoupling formulae, which provide a smooth decoupling in time both, for single and two particle inclusive spectra. They generalise frequently employed instantaneous freeze-out procedures and provide simple relations between the damping width and the duration of the decoupling process. The implications on physical phenomena arising from the expansion and decay dynamics of the highly compressed hadronic matter generated in high energy nuclear collisions are discussed.