Relativistic Hadron-Hadron Collisions in the Ultra-Relativistic Quantum Molecular Dynamics Model (UrQMD)

TL;DR

This paper presents the UrQMD model, a microscopic transport approach for simulating high-energy hadron-hadron collisions, effectively describing phenomena from low to ultra-relativistic energies and aligning well with experimental data.

Contribution

The paper introduces the UrQMD model, combining hadronic interactions and string fragmentation to simulate a wide energy range of hadron collisions, enhancing understanding of particle production mechanisms.

Findings

Model agrees with experimental data across a wide energy spectrum.

UrQMD effectively describes low, intermediate, and high-energy collision phenomenology.

String excitation and fragmentation dominate particle production at high energies.

Abstract

Hadron-hadron collisions at high energies are investigated in the Ultra-relativistic-Quantum-Molecular-Dynamics approach (UrQMD). This microscopic transport model is designed to study pp, pA and A+A collisions. It describes the phenomenology of hadronic interactions at low and intermediate energies ($\sqrt s <5$ GeV) in terms of interactions between known hadrons and their resonances. At high energies, $\sqrt s >5$ GeV, the excitation of color strings and their subsequent fragmentation into hadrons dominates the multiple production of particles in the UrQMD model. The model shows a fair overall agreement with a large body of experimental h-h data over a wide range of h-h center-of-mass energies. Hadronic reaction data with higher precision would be useful to support the use of the UrQMD model for relativistic heavy ion collisions.