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Title

Collision geometry scaling of Au+Au pseudorapidity density from sqrt[SNN]=19.6 to 200 GeV

Author(s)

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

Abstract

The centrality dependence of the midrapidity charged particle multiplicity in Au+Au heavy-ion collisions at sqrt[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).

Publication type

Journal article

Source

Physical Review C, Vol. 70, no. 2 (2004), Article no. 021902

Publication year

2004

FOR Code(s)

0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics

Keyword(s)

Charged particles;  PHOBOS;  Pseudorapidity

Publisher

American Physical Society

ISSN

0556-2813

Publisher URL

http://dx.doi.org/10.1103/PhysRevC.70.021902

Copyright

Copyright © 2004 American Physical Society. The accepted manuscript is reproduced in accordance with the copyright policy of the publisher.

Full text

Peer reviewed