Quarkonium Polarization Measurement in Hadronic and Nuclear Collisions at Forward Rapidity with ALICE at the LHC

Abstract

In this study, we summarize quarkonium polarization measurement obtained using the muon spectrometer of ALICE at forward rapidity in pp and Pb-Pb collisions at the LHC energies. The inclusive J/ψpolarizationparametersλ<inf>θ</inf>,λ<inf>ϕ</inf>,andλ<inf>θϕ</inf> are obtained in helicity, Collins-Soper reference frames for pp and Pb-Pb collisions at A chemical structure diagram showing a hexagonal benzene ring with alternating double bonds. Attached to the ring are two hydroxyl groups (OH) at the first and second positions, and a carboxyl group (COOH) at the third position. = 8 TeV and 5.02 TeV, respectively. Further, the frame invariant parameter λ~isobtainedforppcollisionsandforthefirsttimetheλ<inf>θ</inf> parameter is measured in the event plane frame for Pb-Pb collisions. The quarkonium polarization measurement in hadronic and nuclear collisions constrains the production mechanism. However, in Pb-Pb collisions, it may affected by several other mechanisms such as suppression, regeneration, etc. The experimental measurements are compared with NRQCD and CSM model predictions. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.