Characteristics of charged particle production in relativistic heavyion collisions.pdf

Proc. 19th Winter Workshop on 19th Winter Workshop Nuclear Dynamics (2003) 000–000 on Nuclear Dynamics Breckenridge, Colorado, USA February 8–15, 2003 3 Characteristics of charged particle production in relativistic 0 heavy-ion collisions 0 2 Thomas S. Ullrich for the STAR Collaboration y a Brookhaven National Laboratory, Upton New York 11973-5000, USA M 0 Abstract. Inclusive spectra of charged particles at midrapidity in Au+Au √ 2 collisions at s = 130 GeV and 200 GeV were measured with the STAR NN 1 detector at RHIC. The measured mean transverse momentum pT shows a v characteristic dependence on charged particle multiplicity and beam energy in 8 Au+Au collisions that is distinctly different from pp , pp¯ and e+e− collisions. 1 0 A 32% ± 3%(syst) increase in pT from pp to Au+Au collisions was observed 5 at 200 GeV. While the charged multiplicity was found to increase by 19% ± 0 5%(syst) from √sNN = 130 GeV to 200 GeV, no significant difference in pT 3 was found between the two energies. A comparison with model predictions is 0 discussed. / x e Keywords: mean tra