Source parameters from identified hadron spectra and HBT radii for Ausingle bondAu collisions at image GeV in PHENIX Original Research Article

The characteristics of the particle emitting source are deduced from low pT identified hadron spectra ((mT − m0) < 1GeV) 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 π±, K±, and View the MathML source using the parameterization in [1] and assuming a linear transverse flow profile. Within the systematic uncertainties, the expansion parameters Tfo and βT, 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 not χ2 minimum is found.