Quarkonia production and elliptic flow in small systems measured with ALICE

TL;DR

This paper reports on measurements of quarkonia production and elliptic flow in small systems, providing new data to test and constrain quantum chromodynamics models in high-energy proton-proton collisions.

Contribution

It presents novel measurements of J/ψ production and elliptic flow in high multiplicity pp collisions at 13 TeV, offering insights into collective effects in small systems.

Findings

Measurement of inclusive, prompt, and non-prompt J/ψ production at various energies.

Observation of J/ψ elliptic flow ($v_2$) in high multiplicity pp collisions.

Data helping to constrain QCD models of quarkonia production.

Abstract

The production of quarkonia in hadronic collisions provides a unique testing ground for understanding quantum chromodynamics (QCD) since it involves both the perturbative and non-perturbative regimes of this theory. Given that a satisfactory description of quarkonia production has not yet been achieved, new measurements that can provide new insights, helping to constrain models, are needed. The ALICE apparatus allows to measure inclusive J/$\psi$ production, as well as to separate prompt charmonia from those originating from b-hadron decays. The study of the azimuthal correlation of the emitted particles, e.g. via the measurement of the elliptic flow ($v_2$), in high multiplicity proton-proton (pp) collisions can probe collective behaviour in small systems. In this contribution, we present new measurements of the inclusive, prompt and non-prompt J/$\psi$ production in pp collisions at different collision energies, together with the J/$\psi$ $v_2$ in high multiplicity pp collisions at $\sqrt{s}$=13 TeV.