collisional and radiative energy loss in qed and qcd plasmas

Evaluating the energy loss of an electrically (color) charged particle crossing a high-temperature qed (qcd) plasma at its thermal equilibrium is studied. the average energy loss depends on the particle characteristics, plasma parameters, and qed (qcd) coupling constant α (αs). all processes through which the energy of a particle changes can be categorized into two main mechanisms: elastic collisions and radiation through bremsstrahlung. we have introduced the final results of collisional and radiation energy loss for an electrically charged particle in a qed plasma, as well as a quark in a qcd plasma. the suppression due to radiation is presented using the landau-pomeranchuk-migdal effect.