Scaling properties in bulk and p_T-dependent particle production near midrapidity in relativistic heavy ion collisions

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B. Alver,¹ B. B. Back,² M. D. Baker,³ M. Ballintijn,¹ D. S. Barton,³ R. R. Betts,⁴ R. Bindel,⁵ W. Busza,¹ Z. Chai,³ V. Chetluru,⁴ E. García,⁴ T. Gburek,⁶ K. Gulbrandsen,¹ J. Hamblen,⁷ I. Harnarine,⁴ C. Henderson,¹ D. J. Hofman,⁴ R. S. Hollis,⁴ R. Ho

yński,⁶ B. Holzman,³ A. Iordanova,⁴ J. L. Kane,¹ P. Kulinich,¹ C. M. Kuo,⁸ W. Li,¹ W. T. Lin,⁸ C. Loizides,¹ S. Manly,⁷ A. C. Mignerey,⁵ R. Nouicer,⁴ A. Olszewski,⁶ R. Pak,³ C. Reed,¹ E. Richardson,⁵ C. Roland,¹ G. Roland,¹ J. Sagerer,⁴ I. Sedykh,³ C. E. Smith,⁴ M. A. Stankiewicz,³ P. Steinberg,³ G. S. F. Stephans,¹ A. Sukhanov,³ A. Szostak,³ M. B. Tonjes,⁵ A. Trzupek,⁶ G. J. van Nieuwenhuizen,¹ S. S. Vaurynovich,¹ R. Verdier,¹ G. Veres,¹ P. Walters,⁷ E. Wenger,¹ D. Willhelm,⁵ F. L. H. Wolfs,⁷ B. Wosiek,⁶ K. Woźniak,⁶ S. Wyngaardt,³ and B. Wys

ouch¹

(PHOBOS Collaboration)

¹Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
²Physics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843, USA
³Chemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
⁴Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059, USA
⁵Department of Chemistry, University of Maryland, College Park, Maryland 20742, USA
⁶Institute of Nuclear Physics PAN, Kraków, Poland
⁷Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA
⁸Department of Physics, National Central University, Chung-Li, Taiwan

Received 13 August 2008; published 20 July 2009

Thecentrality dependence of the midrapidity charged-particle multiplicity density (| eta |<1) ispresented for Au+Au and Cu+Cu collisions at RHIC over abroad range of collision energies. The multiplicity measured in theCu+Cu system is found to be similar to that measuredin the Au+Au system, for an equivalent N_part, with theobserved factorization in energy and centrality still persistent in thesmaller Cu+Cu system. The extent of the similarities observed forbulk particle production is tested by a comparative analysis ofthe inclusive transverse momentum distributions for Au+Au and Cu+Cu collisionsnear midrapidity. It is found that, within the uncertainties ofthe data, the ratio of yields between the various energiesfor both Au+Au and Cu+Cu systems are similar and constantwith centrality, both in the bulk yields and as afunction of p_T, up to at least 4 GeV/c. Theeffects of multiple nucleon collisions that strongly increase with centralityand energy appear to only play a minor role inbulk and intermediate transverse momentum particle production.

URL:	http://link.aps.org/doi/10.1103/PhysRevC.80.011901
DOI:	10.1103/PhysRevC.80.011901
PACS:	25.75.Dw; 25.75.Ag 25.75.Dw Particle and resonance production in relativistic heavy-ion collisions 25.75.Ag Global features in relativistic heavy ion collisions YEAR: 2009

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Phys. Rev. C 80, 011901(R) (2009) [5 pages]

Scaling properties in bulk and pT-dependent particle production near midrapidity in relativistic heavy ion collisions

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Scaling properties in bulk and p_T-dependent particle production near midrapidity in relativistic heavy ion collisions