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.