A microscopic description for polarization in particle scatterings

Understand

We propose a microscopic description for the polarization from the first principle through the spin-orbit coupling in particle collisions.

• The model is different from previous ones based on local equilibrium assumptions for the spin degree of freedom.
• It is based on scatterings of particles as wave packets, an effective method to deal with particle scatterings at specified impact parameters.
• The polarization is then the consequence of particle collisions in a non-equilibrium state of spins.