Dependence of hadron spectra on decoupling temperature and resonance contributions

K. J. Eskola, H. Niemi, P. V. Ruuskanen, S. S. Räsänen

Published 2002-06-24, updated 2002-12-13Version 2

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 $\sqrt s=130 A$GeV is found with a single decoupling temperature $\Tdec=150...160$ 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 $\Tdec$. The origin of this result is discussed.