Collisional energy loss above the critical temperature in QCD

Understand

We compute the collisional energy loss for a heavy quark above the critical temperature in Quantum ChromoDynamics (QCD).

• We work in the semi Quark-Gluon Plasma, which assumes that this region is dominated by the non-trivial holonomy of the thermal Wilson line.
• Relative to the result to leading order in perturbation theory, at a fixed value of the coupling constant we generically we find that collisional energy loss is suppressed by powers of the Polyakov loop, l < 1.
• For small values of the loop, this suppression is linear for the scattering off of light quarks, and quadratic for the scattering off of gluons, or for Compton scattering.