Probing the equation of state in the AGS energy range with 3-d hydrodynamics

Details Probing the equation of state in the AGS energy range with 3-d hydrodynamics Probing the equation of state in the AGS energy range with 3-d hydrodynamics

1996-06-20

arxiv.org/abs/hep-ph/9606394v1

Phys.Rev.C55:860-873,1997

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages (.tex) and 9 figures (.ps)

Scientific paper

10.1103/PhysRevC.55.860

The effect of (i) the phase transition between a quark gluon plasma (QGP) and a hadron gas and (ii) the number of resonance degrees of freedom in the hadronic phase on the single inclusive distributions of 16 different types of produced hadrons for Au+Au collisions at AGS energies is studied. We have used an exact numerical solution of the relativistic hydrodynamical equations 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 phase transition from QGP to the Hadronic Phase and two versions of a purely hadronic eos - we find that the first one gives an overall better description of the Au+Au experimental data at $AGS$ energies. We reproduce and analyse measured meson and proton spectra and also make predictions for anti-protons, deltas, anti-deltas and hyperons. The low m_t enhancement in pi- spectra is explained by baryon number conservation and strangeness equilibration. We also find that negative kaon data are more sensitive to the eos, as well as the K-/pi- ratio. All hyperons and deltas are sensitive to the presence of a phase transition in the forward rapidity region. Anti-protons, Omegas and heavy anti-baryons are sensitive in the whole rapidity range.

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