Centrality dependence of the charged particle multiplicity near midrapidity in Au+Au collisions at sqrt[SNN]=130 and 200 GeV

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Title: Centrality dependence of the charged particle multiplicity near midrapidity in Au+Au collisions at sqrt[SNN]=130 and 200 GeV
Author(s): Back, B. B.; Ballintijn, M.; Baker, M. D.; Barton, D. S.; Betts, R. R.; Bickley, A.; Bindel, R.; Budzanowski, A.; Busza, W.; Carroll, A.; Corbo, J.; Decowski, M. P.; Garcia, E.; George, N.; Gulbrandsen, K.; Gushue, S.; Halliwell, C.; Hamblen, J.; Heintzelman, G.; Henderson, C.; Hicks, D.; Hofman, D.; Hollis, R. S.; Holynski, R.; Holzman, B.; Iordanova, A.; Johnson, E.; Kane, J.; Katzy, J.; Khan, N.; Kucewicz, W.; Kulinich, P.; Kuo, C. M.; Lin, W. T.; Manly, S.; McLeod, D.; Michalowski, J.; Mignerey, A.; Mulmenstadt, J.; Nouicer, R.; Olszewski, A.; Pak, R.; Park, I. C.; Pernegger, H.; Rafelski, M.; Rbeiz, M.; Reed, C.; Remsberg, L. P.; Reuter, M.; Roland, C.; Roland, G.; Rosenberg, L.; Sagerer, J.; Sarin, P.; Sawicki, P.; Skulski, W.; Steadman, S. G.; Steinberg, P.; Stephans, G. S. F.; Stodulski, M.; Sukhanov, A.; Tang, J. L.; Teng, R.; Trzupek, A.; Vale, C.; Van Nieuwenhuizen, G. J.; Verdier, R.; Wadsworth, B.; Wolfs, F. L. H.; Wosiek, B.; Wozniak, K.; Wuosmaa, A. H.; Wyslouch, B.
Abstract: The PHOBOS experiment has measured the charged particle multiplicity at midrapidity in Au+Au collisions at sqrt[SNN]=200 GeV as a function of the collision centrality. Results on dNch/dη||η|<1;1 divided by the number of participating nucleon pairs 〈Npart〉/2 are presented as a function of 〈Npart〉. As was found from similar data at sqrt[SNN]=130 GeV the data can be equally well described by parton saturation models and two-component fits, which include contributions that scale as Npart and the number of binary collisions Ncoll. We compare the data at the two energies by means of the ratio R200/130 of the charged particle multiplicity for the two different energies as a function of 〈Npart〉. For events with 〈Npart〉> 100, we find that this ratio is consistent with a constant value of 1.14±0.01(stat)±0.05(syst).
Publication type: Journal article
Source: Physical Review C, Vol. 65, no. 6 (Jun 2002), Article no. 61901
Publication year: 2002
FOR Code(s): 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
Keyword(s): Charged particles; PHOBOS
Publisher: American Physical Society
ISSN: 0556-2813
Publisher URL: http://dx.doi.org/10.1103/PhysRevC.65.061901
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