Charged hadron transverse momentum distributions in Au+Au collisions at SNN=200 GeV

at √ s NN = 200 GeV. The spectra were measured for transverse momenta pT from 0.25 to 4.5 GeV/c in a rapidity range of 0.2 < y� < 1.4. The evolution of the spectra is studied as a function of collision centrality, from 65 to 344 participating nucleons. The results are compared to data from proton- antiproton collisions and Au+Au collisions at lower RHIC energies. We find a significant change of the spectral shape between proton-antiproton and peripheral Au+Au collisions. Comparing peripheral to central Au+Au collisions, we find that the yields at high pT exhibit approximate scaling with the number of participating nucleons, rather than scaling with the number of binary collisions.