J/Psi in high-multiplicity pp collisions: lessons from pA

TL;DR

This paper explores the connection between high-multiplicity proton-proton and proton-nucleus collisions, showing how gluon saturation effects influence J/Psi production and transverse momentum broadening, supported by recent ALICE data.

Contribution

It establishes a theoretical link between nuclear effects in pA and high-multiplicity pp collisions, supported by experimental data on J/Psi production.

Findings

Confirmed the similarity between pA and high-multiplicity pp collisions in J/Psi production.

Predicted transverse momentum broadening of J/Psi in high-multiplicity pp events.

Supported the link with recent ALICE experimental results.

Abstract

Gluons at small x in high-energy nuclei overlap in the longitudinal direction, so the nucleus acts as a single source of gluons, like higher Fock components in a single nucleon, which contribute to inelastic collisions with a high multiplicity of produced hadrons. This similarity helps to make a link between nuclear effects in pA and high-multiplicity pp collisions. Such a relation is well confirmed by data for the J/Psi production rate in high-multiplicity pp events measured recently in the ALICE experiment. Broadening of J/Psi transverse momentum is predicted for high-multiplicity pp collisions.