System size and centrality dependence of charged hadron transverse momentum spectra in Au + Au and Cu + Cu collisions at root s(NN)=62.4 and 200 GeV
van Nieuwenhuizen, G.J.
PublisherAmerican Physical Society
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We present transverse momentum distributions of charged hadrons produced in Cu+Cu collisions at root sNN=62.4 and 200 GeV. The spectra are measured for transverse momenta of 0.25 < p(T)< 5.0 GeV/c at root sNN=62.4 GeV and 0.25 < p(T)< 7.0 GeV/c at root sNN=200 GeV, in a pseudorapidity range of 0.2 <eta < 1.4. The nuclear modification factor R-AA is calculated relative to p+p data at both collision energies as a function of collision centrality. At a given collision energy and fractional cross section, R-AA is observed to be systematically larger in Cu+Cu collisions compared to Au+Au. However, for the same number of participating nucleons, R-AA is essentially the same in both systems over the measured range of p(T), in spite of the significantly different geometries of the Cu+Cu and Au+Au systems.