  The experimental data for identified hadron spectra from pp,d+A and AA
collisions are reviewed. Three regions with different dominant production
mechanisms are considered: soft region (pt <2 GeV/c) - with large degree of
collectivity and thermalization, hard particle production which exhibits
jet-quenching in Au+Au collisions at RHIC and intermediate region (2 < pt <5
GeV/c) with distinct baryon dynamics. Cronin effect, nuclear modification
factors and jet-like correlations are studied with the goal of understanding
the baryon dynamics at RHIC.

Nuclear Experiment