Charged multiplicities in pp and AA collisions at LHC

TL;DR

This paper models charged particle multiplicities in proton-proton and heavy-ion collisions at LHC energies using a generalized eikonal approach, revealing a higher Pomeron intercept and predicting energy dependence and centrality effects.

Contribution

It introduces a generalized eikonal model with shadowing corrections that accurately describes multiplicities and predicts their energy dependence at LHC energies.

Findings

pp data require a Pomeron intercept near 1.2

Energy dependence follows an s^{0.11} trend

Model reproduces AA multiplicity size and centrality dependence

Abstract

The mid-rapidity charged particle multiplicities in pp and AA collisions at LHC energies are described in the framework of a generalized eikonal model with shadowing corrections incorporated in AA. We show that the pp data require a Pomeron intercept close to 1.2, higher than the conventional one close to 1.1. An $s^{0.11}$ energy dependence is obtained in the LHC range and beyond. The size and centrality dependence of the AA multiplicity at $\sqrt{s} = 2.76$ TeV is reproduced and its energy dependence is predicted.