Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2002-09-30
Nucl.Phys. A715 (2003) 498-501
Physics
Nuclear Physics
Nuclear Experiment
4 pages, 4 figures, Contribution to Quark Matter 2002, Nantes, France, July 18-24, 2002. To appear in the proceedings (Nucl. P
Scientific paper
10.1016/S0375-9474(02)01496-3
The characteristics of the particle emitting source are deduced from low transverse momentum identified hadron spectra (transverse mass less than 1 GeV) and HBT radii using a hydrodynamic interpretation. From the most peripheral to the most central data, the single particle spectra are fit simultaneously for all pions, kaons, and (anti-)protons using the parameterization in [1] and assuming a linear transverse flow profile. Within the systematic uncertainties, the expansion parameters called the freeze-out temperature and flow velocity, respectively decrease and increase with the number of participants, saturating for both at mid-centrality. The expansion using analytic calculations of the kT dependence of HBT radii in [2] is fit to the data but no chi-squared minimum is found.
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