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A two-component analysis of spectra to $p_t = 12$ GeV/c for identified pionsand protons from 200 GeV Au-Au collisions is presented. The method is similarto an analysis of the $n_{ch}$ dependence of $p_t$ spectra from p-p collisionsat 200 GeV, but applied to Au-Au centrality dependence. The soft-componentreference is a L\'evy distribution on transverse mass $m_t$. The hard-componentreference is a Gaussian on $y_t$ with exponential ($p_t$ power-law) tail.Deviations of data from the reference are described by hard-component ratio$r_{AA}$ which generalizes nuclear modification factor $R_{AA}$. The analysissuggests that centrality evolution of pion and proton spectra is dominated bychanges in parton fragmentation. The structure of $r_{AA}$ suggests that partonenergy loss produces a negative boost $\Delta y_t$ of a large fraction (but notall) of the minimum-bias fragment distribution, and that lower-energy partonssuffer relatively less energy loss, possibly due to color screening. Theanalysis also suggests that the anomalous $p/\pi$ ratio may be due todifferences in the parton energy-loss process experienced by the two hadronspecies. This analysis provides no evidence for radial flow.

Centrality evolution of $p_t$ and $y_t$ spectra from Au-Au collisions at $\sqrt{s_{NN}} = 200$ GeV