Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-08-09
Nucl.Phys. A566 (1994) 581c-584c
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages, (Talk presented at Quark Matter '93)
Scientific paper
10.1016/0375-9474(94)90698-X
As a preliminary step, the radiation produced by a classical charged current coupled to a quantized $A_{\mu}$ is solved. To each order in $\alpha$, all infrared divergences cancel between the virtual $\gamma$'s and the real $\gamma$'s absorbed from the plasma or emitted into the plasma. When all orders of perturbation theory are summed, the finite answer predicts a suppression of radiation with $\omega< \alpha T$. The analysis of QED then consists of two steps. First, a general probability at $T\neq 0$ is organized so that all the virtual $e^{\pm},\gamma$ are in the amplitudes and all the real $e^{\pm},\gamma$ are in the phase space integrations. Next, the cancellations of IR divergences between virtual and real are demonstrated.
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