Separate mass scaling of the widths of the rapidity distributions for mesons and baryons at energies available at the Facility for Antiproton and Ion research

TL;DR

This study investigates how the widths of rapidity distributions for mesons and baryons scale with beam rapidity at FAIR energies, revealing separate mass-dependent scaling behaviors for these particle types.

Contribution

It demonstrates that the widths of rapidity distributions exhibit separate mass ordering and scaling behavior for mesons and baryons, based on UrQMD simulations and experimental data.

Findings

Width of rapidity distribution scales with beam rapidity.

Separate mass ordering observed for mesons and baryons.

Scaling behavior consistent across simulations and experiments.

Abstract

Evolution of the width of the rapidity distribution on beam rapidity has been studied for a number of produced particles with UrQMD-3.3p1 generated events at various FAIR (Facility for Antiproton and Ion Research) energies. The results for the width of the rapidity distribution with beam rapidity, obtained with UrQMD generated events, are compared with the existing experimental data (E802, E877, E896, E917, NA49). For both UrQMD and experimental data, the width of the rapidity distribution is found to bear scaling behavior with beam rapidity for all the hadrons. Such scaling behavior is found to follow separate mass ordering for the studied mesons and and baryons.