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Quarkonium spin alignment in a vortical medium
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We use a potential model to investigate the phenomenology of quarkonium in a thermal rotating medium, where vorticity and spin density are not necessarily in equilibrium. We find that the quarkonium spin density matrix, as well as the binding energy and melting temperature, are sensitive to both the vorticity and the lack of equilibrium between vorticity and spin. This means that quarkonium spin alignment is a sensitive probe for vorticity and spin within the hydrodynamic phase. Information unequivocably pointing to spin-orbit non-equilibrium dynamics can be obtained from a combined study of quarkonium relative abundance and spin alignment, as well as experimentally obtainable off-diagonal density matrix elements.
Forward citations
Cited by 2 Pith papers
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Transverse and longitudinal spin alignment from color fields in heavy ion collisions
Spin alignment of phi mesons along the beam direction is predicted to exceed 1/3 for glasma fields and to show a sign-changing rapidity pattern for isotropic QGP color fields, offering a discriminating observable.
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Polarization of the $\phi$ meson in the hadronic phase with nucleon scatterings and a viscous hydrodynamic background
Kaon and nucleon rescattering plus viscous corrections in a Fluidum hydrodynamic background yield phi spin alignment consistent with zero, in disagreement with STAR data.
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