Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2005-09-21
Phys.Lett.B635:85-92,2006
Physics
Nuclear Physics
Nuclear Theory
18 pages, 3 figures, revised version accepted for publication in Phys. Lett. B
Scientific paper
10.1016/j.physletb.2006.02.045
The $D$-meson spectral density at finite temperature is obtained within a self-consistent coupled-channel approach. For the bare meson-baryon interaction, a separable potential is taken, whose parameters are fixed by the position and width of the $\Lambda_c (2593)$ resonance. The quasiparticle peak stays close to the free $D$-meson mass, indicating a small change in the effective mass for finite density and temperature. Furthermore, the spectral density develops a considerable width due to the coupled-channel structure. Our results indicate that the medium modifications for the $D$-mesons in nucleus-nucleus collisions at FAIR (GSI) will be dominantly on the width and not, as previously expected, on the mass.
Schaffner-Bielich Jurgen
Stoecker Horst
Tolos Laura
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