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Quarkonium spin alignment in a vortical medium

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arxiv 2305.02985 v2 pith:PCA7H4ZT submitted 2023-05-04 hep-ph nucl-th

classification hep-phnucl-th
keywords spinquarkoniumvorticityalignmentdensityequilibriummatrixmedium
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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.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Transverse and longitudinal spin alignment from color fields in heavy ion collisions

    nucl-th 2024-11 conditional novelty 6.0 of 10

    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.

  2. Polarization of the $\phi$ meson in the hadronic phase with nucleon scatterings and a viscous hydrodynamic background

    hep-ph 2025-07 conditional novelty 5.0 of 10

    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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