Parton energy loss in high energy hard forward processes in   proton-nucleus collisions
  We calculate the spectrum of energy loss differences due to gluon radiation in high energy hard forward processes in proton-nucleus collisions as compared to proton-proton collisions. We find that the nuclear induced energy loss scales linearly with the beam energy. We evaluate the spectrum and "typical" energy losses in a logarithmic and large $N_{c}$ approximation. The energy losses found appear large enough to be phenomenologically important. 
Tseh Liou and A.H. Mueller
hep-ph nucl-th