Enhanced Strange Particle Yields - Signal of a Phase of Massless Particles ?

Abstract

The yields of strange particles are calculated with the UrQMD model for p,Pb(158 AGeV)Pb collisions and compared to experimental data. The yields are enhanced in central collisions if compared to proton induced or peripheral Pb+Pb collisions. The enhancement is due to secondary interactions. Nevertheless, only a reduction of the quark masses or equivalently an increase of the string tension provides an adequate description of the large observed enhancement factors (WA97 and NA49). Furthermore, the yields of unstable strange resonances as the Lambda_star(1520) resonance or the phi meson are considerably affected by hadronic rescattering of the decay products.

arXiv commentContribution to Strangeness 2000 Conf., published in J.Phys.G.:Nucl.Phys.; 7 pages

References in corpus (8)

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• Relativistic Hadron-Hadron Collisions in the Ultra-Relativistic Quantum Molecular Dynamics Model (UrQMD)
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• The parton to hadron phase transition observed in Pb+Pb collisions at 158 GeV per nucleon
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• Hadronic Particle Production in Nucleus-Nucleus Collisions
• Chiral model for dense, hot and strange hadronic matter

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• Strong Color Field Baryonic Remnants in Nucleus-Nucleus Collisions at 200A GeV
• Reconstructing ${\rho }^0$ and $\omega$ mesons from non-leptonic decays in C+C at 2AGeV
• Lambda(1520) production at SPS and RHIC energies
• Phi meson production at RHIC
• Resonances from a Hadronic Fireball
• News on Strangeness at Ultrarelativistic Energies - Review of Microscopic Models
• Phi-Meson Production at RHIC, Strong Color Fields and Intrinsic Transverse Momenta
• Multiplicity dependent $p_T$ distributions of identified particles in pp collisions at 7 TeV within HIJING/$B\bar{B}$ v2.0 model
• Web-page on UrQMD Model Validation