NA49 Data Research Articles

Dynamical evolution of hadronic matter in relativistic collisions.

We use the (3+1)-dimensional string-parton model to study relativistic collisions of heavy ions at CERN energies. Various inclusive hadronic observables, such as transverse energy, [ital dE][sub [ital T]]/[ital d][eta], and rapidity distributions, are calculated and compared with WA80 and NA35 data. We study secondary interactions that occur during the dynamical evolution, and show that these interactions tend to fill the midrapidity region. The dynamical evolution of the energy density of produced mesons and their thermodynamic properties are also studied.

Pion interferometry of O + Au at 200 AGeV

We analyse NA35 data on O + Au → π − π − + X at 200 AGeV including resonance decays and non-ideal dynamical and geometrical effects and find that a r ƒ = τ ⊥ƒ = 4 fm chaotic source is consistent with the data.

Implications of pion interferometry for O+Au at 200 A GeV

Recent NA35 data on O+Au→ π − π − + X at 200 A GeV are shown to be consistent with both a hadronic resonance gas model and a quark-gluon plasma model for this reaction. We show, in addition, that much higher statistics data will be required to differentiate between these models even with the outward and sideward transverse projected correlation functions.