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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 \(J/\psi { polarizationparameters}\lambda _{\theta },\,\lambda _{\phi },\,{ and}\lambda _{\theta \phi } \) are obtained in helicity, Collins-Soper reference frames for pp and Pb-Pb collisions at = 8 TeV and 5.02 TeV, respectively. Further, the frame invariant parameter \(\tilde{\lambda } { isobtainedforppcollisionsandforthefirsttimethe}\lambda _{\theta } \) 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.

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

  • 会议论文

  • 发表日期：

    2025年

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  • Bhagyarathi Sahoo

摘要

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 \(J/\psi { polarizationparameters}\lambda _{\theta },\,\lambda _{\phi },\,{ and}\lambda _{\theta \phi } \) are obtained in helicity, Collins-Soper reference frames for pp and Pb-Pb collisions at = 8 TeV and 5.02 TeV, respectively. Further, the frame invariant parameter \(\tilde{\lambda } { isobtainedforppcollisionsandforthefirsttimethe}\lambda _{\theta } \) 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.