Hadron multiplicity in pp and AA collisions at LHC from the Color Glass Condensate

TL;DR

This paper predicts charged-hadron production in LHC nucleus-nucleus collisions using the color-glass condensate framework, successfully describing existing data and providing insights into gluon saturation effects.

Contribution

It offers a quantitative model for hadron multiplicities at LHC energies based on gluon saturation, extending the color-glass condensate approach to new collision regimes.

Findings

Good agreement with LHC proton-proton data

Successful description of HERA small-x DIS data

Accurate predictions for RHIC nucleus-nucleus multiplicities

Abstract

We provide quantitative predictions for the rapidity, centrality and energy dependencies of inclusive charged-hadron productions for the forthcoming LHC measurements in nucleus-nucleus collisions based on the idea of gluon saturation in the color-glass condensate framework. Our formulation gives very good descriptions of the first data from the LHC for the inclusive charged-hadron production in proton-proton collisions, the deep inelastic scattering at HERA at small Bjorken-x, and the hadron multiplicities in nucleus-nucleus collisions at RHIC.