Campus Units

Physics and Astronomy

Document Type

Article

Publication Version

Published Version

Publication Date

3-2004

Journal or Book Title

Physical Review C

Volume

69

Issue

3

First Page

034909

DOI

10.1103/PhysRevC.69.034909

Abstract

The centrality dependence of transverse momentum distributions and yields for pi(+/-),K+/-,p, and (p) over bar in Au+Au collisions at roots(NN)=200 GeV at midrapidity are measured by the PHENIX experiment at the Relativistic Heavy Ion Collider. We observe a clear particle mass dependence of the shapes of transverse momentum spectra in central collisions below similar to2 GeV/c in p(T). Both mean transverse momenta and particle yields per participant pair increase from peripheral to midcentral and saturate at the most central collisions for all particle species. We also measure particle ratios of pi(-)/pi(+), K-/K+, (p) over bar /p, K/pi, p/pi, and (p) over bar/pi as a function of p(T) and collision centrality. The ratios of equal mass particle yields are independent of p(T) and centrality within the experimental uncertainties. In central collisions at intermediate transverse momenta similar to1.5-4.5 GeV/c, proton and antiproton yields constitute a significant fraction of the charged hadron production and show a scaling behavior different from that of pions.

Comments

This article is published as Adler, Stephen Scott, S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, J. Alexander, R. Amirikas et al. "Identified charged particle spectra and yields in Au+ Au collisions at s N N= 200 GeV." Physical Review C 69, no. 3 (2004): 034909. DOI: 10.1103/PhysRevC.69.034909. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

Included in

Nuclear Commons

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