Centrality dependence of charged hadron transverse momentum spectra in Au + Au collisions from √SNN = 62.4 to 200 GeV

B. B. Back, M. D. Baker, M. Ballintijn, D. S. Barton, R. R. Betts, A. A. Bickley, R. Bindel, W. Busza, A. Carroll, Z. Chai, M. P. Decowski, E. García, T. Gburek, N. George, K. Gulbrandsen, C. Halliwell, J. Hamblen, M. Hauer, C. Henderson, D. J. HofmanR. S. Hollis, R. Hotyński, B. Holzman, A. Lordanova, E. Johnson, J. L. Kane, N. Khan, P. Kulinich, C. M. Kuo, W. T. Lin, S. Manly, A. C. Mignerey, R. Nouicer, A. Olszewski, R. Pak, C. Reed, C. Roland, G. Roland, J. Sagerer, H. Seals, I. Sedykh, C. E. Smith, M. A. Stankiewicz, P. Steinberg, G. S.F. Stephans, A. Sukhanov, M. B. Tonjes, A. Trzupek, C. Vale, G. J. Van Nieuwenhuizen, S. S. Vaurynovich, R. Verdier, G. I. Veres, E. Wenger, F. L.H. Wolfs, B. Wosiek, K. Woźniak, B. Wyslouch

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We have measured transverse momentum distributions of charged hadrons produced in Au + Au collisions at √SNN = 62.4 GeV. The spectra are presented for transverse momenta 0.25 < pT < 4.5 GeV/c, in a pseudorapidity range of 0.2 < η < 1.4. The nuclear modification factor RAA is calculated relative to p + p data at the same collision energy as a function of collision centrality. For 2 < pT < 4.5 GeV/c, RAA is found to be significantly larger than in Au + Au collisions at √SNN =130 and 200 GeV. In contrast to the large change in RAA, we observe a very similar centrality evolution of the pT spectra at √SNN = 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.

Original languageEnglish
Article number082304
JournalPhysical Review Letters
Issue number8
StatePublished - 4 Mar 2005


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