Thermal description of transverse - momentum spectra at RHIC ∗

We present a simple model describing the p⊥-spectra of hadrons measured at RHIC at √ sNN = 130 GeV. Our approach is a combination of the thermal model, used frequently in the studies of the relative hadron yields [1–9], with a model of the hydrodynamic expansion of matter at freeze-out. The main assumptions of the model [10–12] are as follows: i) the chemical freeze-out and the thermal freeze-out occur simultaneously, which means that we neglect elastic rescattering after the chemical freeze-out, ii) all hadronic resonances are included in both the calculation of the hadron multiplicities and the spectra, and iii) a simple form of the freeze-out hypersurface is proposed, which is a generalization of the Bjorken model [13] (see also [14–19]),