Dilepton production in heavy-ion collisions with in-medium spectral functions of vector mesons

Journal Article · Mon Sep 15 00:00:00 EDT 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.78.034910· OSTI ID:21192225

Santini, E; Faessler, Amand; Fuchs, C ^[1]; Cozma, M D ^[1]; Krivoruchenko, M I; Martemyanov, B ^[1]

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1. Institut fuer Theoretische Physik, Tuebingen Universitaet, Auf der Morgenstelle, D-72076 Tuebingen (Germany)

The in-medium spectral functions of {rho} and {omega} mesons and the broadening of nucleon resonances at finite baryon density are calculated self-consistently by combining a resonance dominance model for the vector meson production with an extended vector meson dominance model. The influence of the in-medium modifications of the vector meson properties on the dilepton spectrum in heavy-ion collisions is investigated. The dilepton spectrum is generated for the C+C reaction at 2.0A GeV and compared with recent HADES Collaboration data. The collision dynamics is then described by the Tuebingen relativistic quantum molecular dynamics transport model. We find that an iterative calculation of the vector meson spectral functions that takes into account the broadening of the nucleon resonances due to their increased in-medium decay branchings is convergent and provides a reasonable description of the experimental data in the mass region 0.45{<=}M{<=}0.75 GeV. On the other side, the theoretical calculations slightly underestimate the region m{sub {pi}}{<=}M{<=}0.4 GeV. Popular in-medium scenarios such as a schematic collisional broadening and dropping vector mesons masses are discussed as well.

• OSTI ID: 21192225
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 78, Issue 3; Other Information: DOI: 10.1103/PhysRevC.78.034910; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ATOM-ATOM COLLISIONS
BRANCHING RATIO
CARBON
DECAY
DENSITY
GEV RANGE
HEAVY ION REACTIONS
ITERATIVE METHODS
LEPTONS
MASS
MODIFICATIONS
MOLECULAR DYNAMICS METHOD
NUCLEONS
OMEGA PARTICLES
RELATIVISTIC RANGE
RESONANCE
SPECTRA
SPECTRAL FUNCTIONS
TRANSPORT THEORY
VECTOR DOMINANCE MODEL
VECTOR MESONS