Medium-induced multi-photon radiation
  We study the spectrum of multi-photon radiation off a fast quark in medium in the BDMPS/ASW approach. We reproduce the medium-induced one-photon radiation spectrum in dipole approximation, and go on to calculate the two-photon radiation in the Moli\`{e}re limit. We find that in this limit the LPM effect holds for medium-induced two-photon ladder emission. 
Hao Ma, Carlos A. Salgado and Konrad Tywoniuk
hep-ph