Centrality dependence of charged hadron transverse momentum spectra in Au + Au collisions from square root of s(NN)=62.4 to 200 GeV
van Nieuwenhuizen, GJ
PublisherAmerican Physical Society
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We have measured transverse momentum distributions of charged hadrons produced in Au + Au collisions at square root s(NN) = 62.4 GeV. The spectra are presented for transverse momenta 0.25<p(T)<4.5 GeV/c, in a pseudorapidity range of 0.2<eta<1.4. The nuclear modification factor R-AA is calculated relative to p+p data at the same collision energy as a function of collision centrality. For 2<p(T)<4.5 GeV/c, R-AA is found to be significantly larger than in Au + Au collisions at square root s(NN) = 130 and 200 GeV. In contrast to the large change in R-AA, we observe a very similar centrality evolution of the p(T) spectra at square root s(NN) = 62.4 and 200 GeV. The dynamical origin of this surprising factorization of energy and centrality dependence of particle production in heavy-ion collisions remains to be understood.