Multi-particle interactions within the UrQMD approach

G Burau,H Petersen,M Bleicher,G Gräf

doi:10.1051/epjconf/20111306002

Abstract

A mechanism for locally density-dependent dynamic parton rearrangement and fusion has been implemented into the Ultrarelativistic Quantum Molecular Dynamics (UrQMD) approach. The same mechanism has been previously built in the Quark Gluon String Model (QGSM). This rearrangement and fusion approach based on parton coalescence ideas enables the description of multi-particle interactions, namely 3 ! 3 and 3 ! 2, between (pre)hadronic states in addition to standard binary interactions. The UrQMD model (v2.3) extended by these additional processes allows to investigate implications of multi-particle interactions on the reaction dynamics of ultrarelativistic heavy ion collisions. The mechanism, its implementation and first results of this investigation are presented and discussed.

Highlights

The study of nucleus-nucleus collisions at high energies is a prosperous and exciting field of experimental and theoretical research since many years because those collisions provide a promising way to produce matter with high densities and high temperatures
A mechanism for locally density-dependent dynamic parton rearrangement and fusion has been implemented into the Ultrarelativistic Quantum Molecular Dynamics (UrQMD) approach
Heavy ion reactions at very high initial collision energies are in the focus of these investigations, namely collisions of gold ions with center of mass energies of up to Ecm = 200 GeV at the Relativistic Heavy Ion Collider (RHIC) and, very recently started, collisions of lead nuclei with even higher energies of few TeV per nucleon at the Large Hadron Collider (LHC)

Summary

Introduction

The study of nucleus-nucleus collisions at high energies is a prosperous and exciting field of experimental and theoretical research since many years because those collisions provide a promising way to produce matter with high densities and high temperatures. The UrQMD model (v2.3) extended by these additional processes allows to investigate implications of multi-particle interactions on the reaction dynamics of ultrarelativistic heavy ion collisions. In this work an extension of the UrQMD approach by three-particle interactions, 3 → n (n ≤ 3), realized via dynamic parton rearrangement processes is presented.

Results

Conclusion