Dependence of hadron spectra on decoupling temperature and resonance contributions

Abstract

Using equilibrium hydrodynamics with initial conditions for the energy and net baryon number densities from the perturbative QCD + saturation model, a good simultaneous description of the measured pion, kaon and (anti)proton spectra in central Au+Au collisions at $\sqrt{s}=130A$GeV is found with a single decoupling temperature $\text{Tdec}=\mathrm{150...160}$ MeV. The interplay between the resonance content of the EoS and the development of the transverse flow leads to inverse slopes and $<p_T>$ of hadrons which increase with decreasing $\text{Tdec}$. The origin of this result is discussed.

Comments: 4 pages, 2 eps-figures. Section 3 rewritten, table 1 and figure 1 redrawn, 2 references added