Abstract
In ultrarelativistic heavy-ion collisions a finite-size QCD medium is created. In this paper the radiative energy loss is computed to zeroth order in opacity by taking into account finite-size effects. Transition radiation occurs on the boundary between the finite-size medium and the vacuum, and we show that it lowers the difference between medium and vacuum zeroth-order radiative energy loss relative to the infinite-size medium case. Further, in all previous computations of light parton radiation to zeroth order in opacity, there was a divergence caused by the fact that the energy loss is infinite in the vacuum and finite in the QCD medium. By including the transition radiation, we show that this infinite discontinuity is naturally regulated.
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