Measurement of J/$\psi$ production as a function of multiplicity in pp and p-Pb collisions with ALICE

TL;DR

This paper investigates how J/ψ particle production varies with charged particle multiplicity in proton-proton and proton-lead collisions, providing insights into multiple parton interactions at high energies.

Contribution

It presents new measurements of J/ψ production as a function of multiplicity in pp and p-Pb collisions at different energies, including the first results at 13 TeV with ALICE.

Findings

J/ψ yields increase with multiplicity in both collision types.

Results are consistent with some theoretical models.

Provides new data at 13 TeV for the first time.

Abstract

The increase of hard probe production as a function of the charged particle multiplicity in proton-proton and proton-lead collisions is considered to be an interesting observable for the study of multiple parton interactions. In the present work, the correlation between J/$\psi$ production and charged particle multiplicity has been reviewed in pp collisions at $\sqrt{s} = 7$ and 13 TeV and p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV at mid- and forward rapidities. The J/$\psi$ measurement in pp collisions at $\sqrt{s}$ = 13 TeV using events triggered by the ALICE electromagnetic calorimeter at midrapidity is discussed in this report, too. An increment of the relative J/$\psi$ yields has been observed as a function of the multiplicity. The results have also been compared to theoretical model predictions.