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Spin Polarizations in a Covariant Angular-Momentum-Conserved Chiral Transport Model

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arxiv 1910.06774 v2 pith:MEOXIHGT submitted 2019-10-15 nucl-th hep-phnucl-ex

Shuai Y.F. Liu , Yifeng Sun , Che Ming Ko This is my paper · ORCID
classification nucl-thhep-phnucl-ex
keywords quarkspinchiralangular-momentum-conservedcovariantdirectionfindjumps
verification ladder T0 review T1 audit T2 compute T3 formal

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Using a covariant and angular-momentum-conserved chiral transport model, which takes into account the spin-orbit interactions of chiral fermions in their scatterings via the side jumps, we study the quark spin polarization in quark matter. For a system of rotating and unpolarized massless quarks in an expanding box, we find that side jumps can dynamically polarize the quark spin and result in a final quark spin polarization consistent with that of thermally equilibrated massless quarks in a self-consistent vorticity field. For the quark matter produced in noncentral relativistic heavy ion collisions, we find that in the medium rest frame both the quark local spin polarizations in the direction perpendicular to the reaction plane and along the longitudinal beam direction show an azimuthal angle dependence in the transverse plane similar to those observed in experiments for the Lambda hyperon.

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Cited by 3 Pith papers

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

  1. Covariant equations of motion of massive spinning particles in a background Yang-Mills field

    nucl-th 2025-11 conditional novelty 6.0 of 10

    A spinning quark in a background Yang-Mills field obeys a new, constraint-preserving, gauge-invariant set of classical equations of motion that reduce to the Wong equations when spin effects are turned off.

  2. Vector and Tensor Spin Polarization for Vector Bosons at Local Equilibrium

    hep-ph 2024-12 conditional novelty 6.0 of 10

    Vector meson spin alignment at local equilibrium is shown to arise only at second order in thermodynamic gradients, with explicit analytic formulas for the contributing terms.

  3. 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.

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