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ID 19496
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creator
PHENIX Collaboration
Enokizono, Akitomo
Hachiya, Takashi
Kohama, Takeshi
Nakamura, Tomoaki
abstract
We present the results of φ meson production in the K+K- decay channel from Au+Au collisions at √sNN=200 GeV as measured at midrapidity by the PHENIX detector at Brookhaven National Laboratory's Relativistic Heavy Ion Collider. Precision resonance centroid and width values are extracted as a function of collision centrality. No significant variation from the Particle Data Group accepted values is observed, contrary to some model predictions. The φ transverse mass spectra are fitted with a linear exponential function for which the derived inverse slope parameter is seen to be constant as a function of centrality. However, when these data are fitted by a hydrodynamic model the result is that the centrality-dependent freeze-out temperature and the expansion velocity values are consistent with the values previously derived from fitting identified charged hadron data. As a function of transverse momentum the collisions scaled peripheral-to-central yield ratio RCP for the φ is comparable to that of pions rather than that of protons. This result lends support to theoretical models that distinguish between baryons and mesons instead of particle mass for explaining the anomalous (anti) proton yield.
journal title
Physical Review C - Nuclear Physics
volume
Volume 72
issue
Issue 1
start page
014903-1
end page
014903-23
date of issued
2005-06-14
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) 2005 The American Physical Society.
relation url
department
Graduate School of Science