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Vector meson's spin alignments in high energy reactions

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arxiv 2407.06480 v2 pith:YQ3BR5EH submitted 2024-07-09 hep-ph

classification hep-ph
keywords collisionsspinvectoralignmentshadronizationheavyquarkbeen
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

The global spin alignment of vector mesons has been observed by the STAR collaboration at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory (BNL). It provides a unique opportunity to probe the correlation between the polarized quark and antiquark in the strongly coupled quark-gluon plasma (sQGP) produced in relativistic heavy ion collisions, opening a new window to explore the properties of sQGP. In addition, spin alignments of vector mesons have also been observed in other high-energy particle collisions such as $e^+e^-$ annihilations at high energies where hadron production is dominated by quark fragmentation mechanism. The results obtained are quite different from those obtained in heavy ion collisions where quark coalescence/combination mechanism dominates suggesting strong dependence on hadronization mechanisms. So comprehensive studies in different hadronization processes are needed. In this article, we present a brief review of theoretical and experimental advances in the study of vector meson's spin alignments in a variety of high-energy particle collisions, with emphasis on hadronization mechanisms.

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Cited by 5 Pith papers

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

  1. An improved formula for Wigner function and spin polarization in a decoupling relativistic fluid at local thermodynamic equilibrium

    nucl-th 2025-09 conditional novelty 7.0 of 10

    A new derivation gives the spin polarization of emitted fermions in terms of thermal vorticity and shear evaluated on the decoupling surface, with the shear term expressed through the local hypersurface normal rather ...

  2. Spectral Functions of $J/\psi$ Meson in Rotating Thermal Background from Holography

    hep-th 2026-08 conditional novelty 6.0 of 10

    In a rotating thermal medium modeled by soft-wall holography, J/ψ spectral peaks split by −ΩJ_z along the rotation axis and acquire projection-dependent distortions for transverse momentum.

  3. Spin polarization from nucleon-nucleon scatterings in intermediate-energy heavy-ion collisions

    nucl-th 2025-06 conditional novelty 5.0 of 10

    Nucleon-nucleon scatterings with phase-shift-derived spin changes and rigorous angular momentum conservation generate 1-2% spin polarization in intermediate-energy heavy-ion collisions.

  4. Chromomagnetic Condensate in Finite-Temperature SU(2) Yang-Mills Theory under Imaginary Rotation

    hep-ph 2026-02 conditional novelty 4.0 of 10

    At one loop, imaginary rotation in the SU(2) Savvidy model enhances the chromomagnetic condensate and effective coupling, can suppress the Nielsen-Olesen instability in a finite window, and gives a negative moment-of-...

  5. Spin alignment of vector mesons in heavy-ion collision

    hep-ph 2025-07 conditional novelty 1.0 of 10

    A proceedings review in which the authors argue that strong-field fluctuations, not shear stress, explain the measured phi meson spin alignment in heavy-ion collisions.

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