Mass Correction to Chiral Kinetic Equations

Understand

We study fermion mass correction to chiral kinetic equations in electromagnetic fields.

• Different from the chiral limit where fermion number density is the only independent distribution, the number and spin densities are coupled to each other for massive fermion systems.
• To the first order in $\hbar$, we derived the quantum correction to the classical on-shell condition and the Boltzmann-type transport equations.
• To the linear order in the fermion mass, the mass correction does not change the structure of the chiral kinetic equations and behaves like additional collision terms.