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The effect of (i) the phase transition between a quark gluon plasma (QGP) anda hadron gas and (ii) the number of resonance degrees of freedom in thehadronic phase on the single inclusive distributions of 16 different types ofproduced hadrons for Au+Au collisions at AGS energies is studied.  We have used an exact numerical solution of the relativistic hydrodynamicalequations without free parameters which, because of its 3-d character,constitutes a considerable improvement over the classical Landau solution.  Using two different equations of state (eos) - one containing a phasetransition from QGP to the Hadronic Phase and two versions of a purely hadroniceos - we find that the first one gives an overall better description of theAu+Au experimental data at $AGS$ energies.  We reproduce and analyse measured meson and proton spectra and also makepredictions for anti-protons, deltas, anti-deltas and hyperons. The low m_tenhancement in pi- spectra is explained by baryon number conservation andstrangeness equilibration.  We also find that negative kaon data are more sensitive to the eos, as wellas the K-/pi- ratio. All hyperons and deltas are sensitive to the presence of aphase transition in the forward rapidity region. Anti-protons, Omegas and heavyanti-baryons are sensitive in the whole rapidity range.Comment: 25 pages (.tex) and 9 figures (.ps

physical review c

Probing the equation of state in Au+Au at 11 GeV/nucleon with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn /><mml:mo>(</mml:mo><mml:mn>3</mml:mn><mml:mo>+</mml:mo><mml:mn>1</mml:mn><mml:mo>)</mml:mo><mml:mn /></mml:math>-dimensional hydrodynamics

Probing the equation of state in Au+Au at 11 GeV/nucleon with(3+1)-dimensional hydrodynamics