Abstract
The computation of radiative energy loss in a finite size QCD medium with dynamical constituents is a key ingredient for obtaining reliable predictions for jet quenching in ultra-relativistic heavy-ion collisions. It was previously shown that energy loss in a dynamical QCD medium is significantly higher compared to that in a static QCD medium. To understand this difference, we here analyze magnetic and electric contributions to energy loss in a dynamical QCD medium. We find that the significantly higher energy loss in the dynamical case is entirely due to the appearance of magnetic contribution in the dynamical medium. While for asymptotically high energies, the energy loss in the static and dynamical media approaches the same value, we find that the physical origin of the energy loss in these two cases is different.
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