Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2003-06-18
Phys.Rev.Lett.91:072302,2003
Physics
Nuclear Physics
Nuclear Experiment
5 pages, 4 figures, submitted to PRL
Scientific paper
10.1103/PhysRevLett.91.072302
We have measured transverse momentum distributions of charged hadrons produced in d+Au collisions at sqrt(s_NN) = 200 GeV. The spectra were obtained for transverse momenta 0.25 < p_T < 6.0 GeV/c, in a pseudorapidity range of 0.2 < eta < 1.4 in the deuteron direction. The evolution of the spectra with collision centrality is presented in comparison to p+pbarcollisions at the same collision energy. With increasing centrality, the yield at high transverse momenta increases more rapidly than the overall particle density, leading to a strong modification of the spectral shape. This change in spectral shape is qualitatively different from observations in Au+Au collisions at the same energy. The results provide important information for discriminating between different models for the suppression of high-p_T hadrons observed in Au+Au collisions.
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