Kaon and Pion Ratio Probes of Jet Quenching in Nuclear Collisions
  Non-abelian energy loss in quark gluon plasmas is shown to lead to novel hadron ratio suppression patterns in ultrarelativistic nuclear collisions. We apply GLV estimates for the gluon radiative energy loss. The K^-/K^+ and K^+/\pi^+ ratios are found to be most sensitive to the initial density of the plasma. 
P. Levai, G. Papp, G. Fai, M. Gyulassy