$J/\Psi$ yield vs. multiplicity in proton-proton collisions at the LHC

TL;DR

This paper investigates how the production of $J/$ particles varies with event multiplicity in proton-proton collisions at the LHC, proposing a new observable to better understand underlying event dynamics.

Contribution

It introduces a novel observable linking $J/$ yield to event multiplicity and explores its sensitivity to multiple interaction models in PYTHIA.

Findings

$J/$ yield increases with multiplicity in simulations.

The observable can discriminate between different multiple interaction models.

Potential for experimental measurement to improve understanding of underlying events.

Abstract

We address the question of understanding the production of $J/\psi$ particles regarding the global underlying event in proton-proton collisions. To do so, we propose to look at a new observable: the $J/\psi$ production as a function of the charged particles multiplicity of the event. We demonstrate the interest for an experimental measurement by varying the model of multiple interactions in the PYTHIA generator.