Cherenkov Glue in Opaque Nuclear Medium
  The spectrum of Cherenkov gluons is calculated within the framework of in-medium QCD. It is compared with experimental data on the double-humped structure around the away-side jet obtained at RHIC. The values of the real and imaginary parts of the nuclear permittivity are obtained from these fits. It is shown that accounting for an additional smearing due to resonance-like production of final hadrons allows to achieve an agreement with experimental data. 
I.M. Dremin, M.R. Kirakosyan, A.V. Leonidov, A.V. Vinogradov