Transition Radiation in QCD matter

Details Transition Radiation in QCD matter Transition Radiation in QCD matter

2005-12-22

arxiv.org/abs/nucl-th/0512089v1

Phys.Rev.C73:044912,2006

Physics

Nuclear Physics

Nuclear Theory

21 page, 22 figures

Scientific paper

10.1103/PhysRevC.73.044912

In ultrarelativistic heavy ion collisions a finite size QCD medium is created. In this paper we compute radiative energy loss 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. We show that this infinite discontinuity is naturally regulated by including the transition radiation.

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