Spin evolution of massive fermion in QED plasma

The dynamical evolution of spin a massive probe fermion in hot QED plasma at local equilibrium is investigated through the quantum kinetic theory. We consider undergoing 2-by-2 Coulomb scattering with massless fermions medium. axial equation derived including collision terms to first order gradients and leading logarithmic coupling. are vanishing global equilibrium, around which relaxation time can be extracted as an operator. further decompose into equations axial-charge density well transverse magnetic dipole moment. polarization rate diffusion estimated limit nonrelativistic limit, between both effects illustrated preliminary numerical analysis.