J/$\psi$ production as a function of charged-particle multiplicity in pp collisions at $\sqrt{s}$ = 5.02 TeV with ALICE

TL;DR

This study investigates how J/ψ production varies with charged-particle multiplicity in proton-proton collisions at 5.02 TeV, revealing a linear increase and insights into rapidity dependence, with comparisons to theoretical models.

Contribution

First measurement of J/ψ yield dependence on multiplicity at 5.02 TeV in pp collisions, highlighting rapidity effects and energy independence.

Findings

J/ψ yield increases linearly with multiplicity

The increase is independent of collision energy

Strong rapidity dependence observed in the results

Abstract

The relative J/$\psi$ yields as a function of relative charged-particle multiplicity in pp collisions at $\sqrt{s}$ = 5.02 TeV, measured at forward rapidity, are investigated for the first time. A linear increase of the relative J/$\psi$ yield with respect to multiplicity is observed. A comparison of the findings of the present work with the available ALICE measurements obtained in pp collisions at $\sqrt{s}$ = 13 TeV at forward and mid-rapidity indicates that the increase of J/$\psi$ with multiplicity is independent of energy but exhibits a strong dependence on the rapidity gap between the J/$\psi$ and multiplicity measurements. The results are compared with theoretical model calculations.