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Quantum Kinetic Theory for Quantum Chromodynamics

High Energy Physics - Phenomenology 2026-03-05 v1 Nuclear Theory

Abstract

We develop a quantum kinetic theory for QCD, which incorporates all leading order collision terms. At lowest order in gradient expansion, it reproduces the spin-averaged Boltzmann equation with both elastic and inelastic collisions. At next order in gradient expansion, the solution to the quantum kinetic equations give spin polarization of on-shell quarks and gluons in quark-gluon plasma when the gradients are of hydrodynamic ones. A power counting in the coupling shows the spin polarization behaves differently in vortical and non-vortical gradients: the former is free of collisional contribution to leading order, while the latter contains a collisional contribution at parametrically the same order as the free theory counterpart. We also find the inelastic collision in a spin basis provides a possible mechanism for conversion between spin and orbital angular momentum.

Keywords

Cite

@article{arxiv.2603.04263,
  title  = {Quantum Kinetic Theory for Quantum Chromodynamics},
  author = {Shu Lin},
  journal= {arXiv preprint arXiv:2603.04263},
  year   = {2026}
}

Comments

44 pages, 18 figures

R2 v1 2026-07-01T11:03:24.085Z