The Open Nuclear & Particle Physics Journal

2010, 3 : 1-15
Published online 2010 October 26. DOI: 10.2174/1874415X01003010001
Publisher ID: TONPPJ-3-1

Propagation of Vector-Meson Spectral-Functions in a BUU Type Transport Model: Application to Di-Electron Production

H.W. Barz1 , B. Kämpfer , Gy. Wolf and M. Zétényi
this author at the Forschungszentrum Dresden-Rossendorf, Institut für Strahlenphysik, PF 510119, 01314 Dresden, Germany

ABSTRACT

The time evolution of vector-meson spectral-functions is studied within a kinetic theory approach. We implement this formalism in a BUU type transport model. Applications focus on ρ and ɷ mesons being important pieces for the interpretation of the di-electron invariant mass spectrum measured by the HADES collaboration for the reaction C + C at 2 AGeV bombarding energy. Since the evolution of the spectral functions is driven by the local density, the in-medium modifications are tiny for small collision systems within this approach, as the life time of the compressed stage is too short.

PACS numbers: 21.65.+f, 24.10.Cn, 24.10.Jv, 26.60.+C

Keywords:

Heavy-ion collisions, compressed nuclear matter, di-electron emission, broad resonance.