Abstract
We present results from the PHOBOS experiment on charged hadron production over a large range in \(p_{\rm T}\), from Data from d + Au collisions at \(\sqrt{s_{NN}} = 200\) GeV and Au + Au collisions at \(\sqrt{s_{NN}} = 62.4\) and 200 GeV are shown. The data indicate that in Au + Au collisions a strongly interacting state of matter is formed, that appears qualitatively different from the system formed in pp or d + Au collisions. The systematics of particle production in d + Au and Au + Au collisions exhibit remarkably simple scaling rules, including an apparent factorization of the energy and centrality dependence over a wide range of collision energies.
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