Spin polarization formula for Dirac fermions at local equilibrium
Abstract
We derive a Cooper-Frye type spin polarization formula for Dirac fermions at local thermal equilibrium described by a grand canonical ensemble specified by temperature, fluid velocity, chemical potential, and spin potential. We discuss the physical meaning of different contributions to spin polarization and compare them with previous work. The present formula provides machinery to convert the spin potential computed in, e.g., relativistic spin hydrodynamics to the spin polarization observable in, e.g., heavy-ion collisions.
- Publication:
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Science China Physics, Mechanics, and Astronomy
- Pub Date:
- July 2022
- DOI:
- 10.1007/s11433-022-1903-8
- arXiv:
- arXiv:2109.15301
- Bibcode:
- 2022SCPMA..6572011L
- Keywords:
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- spin polarization;
- local equilibrium;
- spin kinetic theory;
- Nuclear Theory;
- High Energy Physics - Phenomenology;
- Nuclear Experiment
- E-Print:
- V3: 9 pages, no figure