Speaker
Description
Quarkonia production in high-energy proton-proton (pp) collisions serves as an important probe for studying quantum chromodynamics (QCD) in vacuum. Understanding the production mechanism of the J/$\psi$, a bound state of a charm and anticharm quark, is essential for constraining both perturbative and non-perturbative aspects of QCD calculations. The polarization of quarkonia in pp collisions is a powerful observable for distinguishing between various QCD-based models of quarkonium production. Furthermore, J/$\psi$ polarization measurements in pp collisions provide a valuable reference for investigating the behavior of charmonium in the quark-gluon plasma formed in nucleus-nucleus collisions.
In this contribution, we will present the first preliminary results of the inclusive J/$\psi$ polarization measurement via the dielectron decay channel at midrapidity (|y| < 0.9) in pp collisions at $\sqrt{s} = 13.6$ TeV. This analysis will be discussed alongside previous J/$\psi$ measurements at forward rapidity and related results, including vector mesons such as $\phi$ and $K^*$ in pp collisions from ALICE Run 2 data. Additionally, the J/$\psi$ polarization with respect to the event plane in heavy-ion collisions will also be discussed.
