The Ter-Mikaelian and Landau–Pomeranchuk effects for induced soft gluon radiation in a QCD medium

Abstract The polarization of a surrounding QCD medium modifies the induced gluon radiation spectrum of a high-energy parton at small transverse momenta for a single interaction and for multiple scatterings as well. This effect is an analogue of the Ter-Mikaelian effect in QED, superimposed to the Landau–Pomeranchuk effect. We study the Ter-Mikaelian effect in a phase space region where Abelian radiation does not occur. In this region the induced gluon radiation is shown to be suppressed due to polarization properties of the medium.