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ID 19493
file
creator
PHENIX Collaboration
Enokizono, Akitomo
Hachiya, Takashi
Kohama, Takeshi
Nakamura, Tomoaki
subject
nuclei with mass number 190 to 219
pion production
kaon production
proton production
heavy ion-nucleus reactions
abstract
The centrality dependence of transverse momentum distributions and yields for π±,K±, p, and p in Au + Au collisions at √sNN=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 ∼2 GeV/c in pT. 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 π-/π+, K -/K+, p̅/p, K/π, p/π, and p̅/π as a function of pT and collision centrality. The ratios of equal mass particle yields are independent of pT and centrality within the experimental uncertainties. In central collisions at intermediate transverse momenta ∼1.5-4.5 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.
journal title
Physical Review C - Nuclear Physics
volume
Volume 69
issue
Issue 3
start page
034909-1
end page
034909-32
date of issued
2004-03-29
publisher
American Physical Society
issn
0556-2813
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2004 The American Physical Society.
relation url
department
Graduate School of Science