Collision geometry scaling of Au+Au pseudorapidity density from √SNN=19.6 to 200 GeV

B. B. Back, M. D. Baker, M. Ballintijn, D. S. Barton, R. R. Betts, A. A. Bickley, R. Bindel, A. Budzanowski, W. Busza, A. Carroll, M. P. Decowski, E. García, N. George, K. Gulbrandsen, S. Gushue, C. Halliwell, J. Hamblen, G. A. Heintzelman, C. Henderson, D. J. HofmanR. S. Hollis, R. Hołyński, B. Holzman, A. Iordanova, E. Johnson, J. L. Kane, J. Katzy, N. Khan, W. Kucewicz, P. Kulinich, C. M. Kuo, W. T. Lin, S. Manly, D. McLeod, A. C. Mignerey, R. Nouicer, A. Olszewski, R. Pak, I. C. Park, H. Pernegger, C. Reed, L. P. Remsberg, M. Reuter, C. Roland, G. Roland, L. Rosenberg, J. Sagerer, P. Sarin, P. Sawicki, W. Skulski, P. Steinberg, G. S.F. Stephans, A. Sukhanov, M. B. Tonjes, J. L. Tang, A. Trzupek, C. Vale, G. J. Van Nieuwenhuizen, R. Verdier, F. L.H. Wolfs, B. Wosiek, K. Woźniak, A. H. Wuosmaa, B. Wysłouch

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The centrality dependence of the midrapidity charged particle multiplicity in Au+Au heavy-ion collisions at √SNN=19.6 and 200 GeV is presented. Within a simple model, the fraction of hard (scaling with number of binary collisions) to soft (scaling with number of participant pairs) interactions is consistent with a value of x=0.13±0.01(stat)±0. 05(syst) at both energies. The experimental results at both energies, scaled by inelastic p(p̄)+p collision data, agree within systematic errors. The ratio of the data was found not to depend on centrality over the studied range and yields a simple linear scale factor of R200/19.6=2.03±0. 02(stat) ±0.05(syst).

Original languageEnglish
Article number021902
Pages (from-to)021902-1-021902-5
JournalPhysical Review C - Nuclear Physics
Issue number2
StatePublished - Aug 2004


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