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ID 19492
file
creator
PHENIX Collaboration
Enokizono, Akitomo
Hachiya, Takashi
Kohama, Takeshi
Nakamura, Tomoaki
subject
heavy ion-nucleus reactions
quark production
charm particles
psi mesons
gold
nuclear matter
quark-gluon plasma
abstract
First results on charm quarkonia production in heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC) are presented. The yield of J/ψ's measured in the PHENIX experiment via electron-positron decay pairs at midrapidity for Au-Au reactions at √SNN=200 GeV is analyzed as a function of collision centrality. For this analysis we have studied 49.3 × 106 minimum bias Au-Au reactions. We present the J/ψ invariant yield dN/dy for peripheral and midcentral reactions. For the most central collisions where we observe no signal above background, we quote 90% confidence level upper limits. We compare these results with our J/ψ measurement from proton-proton reactions at the same energy. We find that our measurements are not consistent with models that predict strong enhancement relative to binary collision scaling.
journal title
Physical Review C - Nuclear Physics
volume
Volume 69
issue
Issue 1
start page
014901-1
end page
014901-10
date of issued
2004-01-26
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