Scaling behaviour of $dN/dy$ in high-energy collisions

TL;DR

This paper derives simple formulae from relativistic hydrodynamics solutions to describe rapidity distributions in high-energy collisions, revealing a universal scaling behavior that suggests collective dynamics in proton-proton collisions.

Contribution

It introduces a new scaling function and analytic formulae that unify rapidity distribution data across experiments, indicating collective behavior in high-energy $p+p$ collisions.

Findings

Rapidity distributions collapse onto a single curve across experiments.

The derived formulae effectively describe the data.

Evidence suggests collective phenomena in proton-proton collisions.

Abstract

From a recently found family of analytic, finite and accelerating 1+1-dimensional solutions to perfect fluid relativistic hydrodynamics, we derive simple and powerful formulae to describe the rapidity and pseudorapidity density distributions. By introducing a new scaling function, we notice that the rapidity distribution data of the different experiments all collapse into a single curve. This data-collapsing (or scaling) behaviour in the rapidity distributions suggests that high-energy $p+p$ collisions may be described as collective systems.