Evolution of particle density in high-energy pp collisions

TL;DR

This paper investigates how particle density evolves with beam rapidity in high-energy proton-proton collisions using the string percolation model, revealing a growing plateau width, violation of limiting fragmentation, and a step-function density profile.

Contribution

It introduces a detailed analysis of particle density evolution in pp collisions within the string percolation framework, highlighting new behaviors like the increasing plateau width and density reduction to a step function.

Findings

Plateau width increases proportionally with beam rapidity.

Limiting fragmentation is violated at high energies.

Particle density reduces to a step function.

Abstract

We study the evolution of the particle density, dn/d\eta at fixed \eta with the beam rapidity Y in the framework of string percolation model. Our main results are: (i) The width of the "plateau" increases proportionally to Y, (ii) limiting fragmentation is violated, and (iii) the particle density, reduces to a step function.