Measuring chiral imbalance with collisional energy loss

We compute the collisional energy loss of an {energetic} massive fermion crossing a chiral plasma at finite temperature characterized by imbalance between populations left-handed and right-handed fermions. find new contribution to which is proportional helicity test depends on amount in plasma. then difference with two opposite helicities, assess whether this could be used quantify that leading these helicity-dependent contributions comes from exchange hard photons (or gluons for QCD) medium constituents, some scenarios can become comparable leading-order result without any imbalance. also evaluate arising soft photon exchange, subleading effect, requires regularization. illustrate how dimensional regularization well suited prescription applied computations.