Spin alignment of Quarkonia: A Possible Probe of Deconfined QCD matter in Pb+Pb Collisions at √s_{\rm NN} = 5.02 TeV

2025/06/11 by Bhagyarathi Sahoo, Captain R. Singh, Sahoo, Bhagyarathi +3 · 1 citation
#hep-ph #hep-ex #hep-th #nucl-ex #nucl-th

paper · pdf · doi:10.48550/arxiv.2506.09405

Abstract

In this study, we investigate the influence of deconfined QCD matter on quarkonium spin alignment in ultra-relativistic heavy-ion collisions. We estimate the spin alignment of charmonium (J/ψ, and ψ(2S)) and bottomonium (Υ(1S), and Υ(2S)) states for Pb+Pb collisions at √s_{\rm NN} = 5.02 TeV as a function of transverse momentum by calculating the energy eigenvalues in a thermal rotating medium. We solve the Schrödinger equation with a medium-modified color-singlet potential, considering the coupling of spin with vorticity and magnetic field. Furthermore, we evaluate the effect of medium temperature, vorticity, magnetic field, and momentum-space anisotropy on the elements of the spin density matrix. Our findings reveal that vorticity increases the spin alignment, while the magnetic fields and anisotropy modify the observables in a state-dependent manner. These findings deepen our understanding of quarkonium spin alignment in an anisotropic magneto-vortical thermal medium, shedding light on spin transport phenomena in heavy-ion collisions.

Citations

• Thermoelectric Thomson coefficient of quark-gluon plasma in the presence of a time-varying magnetic field
• Rotational Brownian motion and heavy quark polarization in QCD medium
• Thermal dilepton polarization and dynamics of the QCD plasma in relativistic heavy-ion collisions
• Meson spin alignment and baryon polarization from coalescence with spin-vorticity non-equilibrium
• Estimating Longitudinal Polarization of Λ and Λ Hyperons at Relativistic Energies using Hydrodynamic and Transport models
• Impact of strong magnetic field, baryon chemical potential, and medium anisotropy on polarization and spin alignment of hadrons
• Anisotropic Hydrodynamics: Three Lectures
• Quantum Mechanics in a Rotating Frame

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• Tensor Spin Polarization Induced by Curved Freeze-Out Hypersurface

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• An analysis of the spin density matrix of quarkonium in heavy ion collisions