Transition radiation in QCD matter

Journal Article · Sat Apr 15 04:00:00 EDT 2006 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.73.044912· OSTI ID:20771478

Djordjevic, Magdalena ^[1]

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1. Department of Physics, Columbia University, New York, New York 10027 (United States)

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.

• OSTI ID: 20771478
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 73; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
HEAVY ION REACTIONS
NUCLEAR MATTER
OPACITY
QUANTUM CHROMODYNAMICS
RELATIVISTIC RANGE
TRANSITION RADIATION