Three-body collisions in Boltzmann-Uehling-Uhlenbeck theory

Abstract

Aiming at a microscopic description of heavy ion collisions in the beam energy region of about 10 A GeV, we extend the Giessen Boltzmann-Uehling-Uhlenbeck (GiBUU) transport model by including a relativistic mean field, in-medium baryon-baryon cross sections and three-body collisions. The model is then compared with experimental data for central Au+Au collisions at 2-10 A GeV and central Pb+Pb collisions at 30 and 40 A GeV on the proton rapidity spectra, the midrapidity yields of ${\pi }^{+}$, $K^{\pm }$ and $(\Lambda +{\Sigma }^0)$, and the transverse mass spectra of ${\pi }^{\pm }$ and $K^{\pm }$. The three-body collisions increase the inverse slope parameters of the hadron $m_{\perp }$-spectra to a good agreement with the data.

arXiv comment26 pages, 9 figures, figures added, discussion extended, results not changed, version accepted in Phys. Rev. C

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• Baryon Stopping in Heavy-Ion Collisions at E_{lab}= 2--160 GeV/nucleon
• Hybrid model calculations of direct photons in high-energy nuclear collisions
• Transverse-Mass Effective Temperature in Heavy-Ion Collisions from AGS to SPS
• Possibility of cold nuclear compression in antiproton-nucleus collisions
• Enabling comparison of UrQMD with Geant4 hadronic models
• Strangeness Production in low energy Heavy Ion Collisions via Hagedorn Resonances
• Transverse-Mass Spectra in Heavy-Ion Collisions at energies E_{lab} = 2--160 GeV/nucleon
• Baryon stopping as a signal of the mixed phase onset
• Production of fragments with and without strangeness within a combined BUU+SMM approach
• Transverse momentum spectra of hadrons produced in central heavy-ion collisions
• Nonequilibrium effects in hadronic fireball expansion
• Chiral Symmetry in Nuclei -- Theoretical Expectations and Hard Facts
• Isospin effects in a covariant transport approach to spallation reactions: Analysis of $p+Fe$ and $Pb$ reactions at 0.8, 1.2 and 1.6 GeV
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