Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2003-09-30
Nucl.Phys. A741 (2004) 81-148
Physics
Nuclear Physics
Nuclear Theory
71 pages, 31 figures, accepted for Publication in Nuclear Physics A; minor modifications of the manuscript, several typos corr
Scientific paper
10.1016/j.nuclphysa.2004.05.016
We study the in-medium properties of mesons $(\pi,\eta,\rho)$ and baryon resonances in cold nuclear matter within a coupled-channel analysis. The meson self energies are generated by particle-hole excitations. Thus multi-peak spectra are obtained for the mesonic spectral functions. In turn this leads to medium-modifications of the baryon resonances. Special care is taken to respect the analyticity of the spectral functions and to take into account effects from short-range correlations both for positive and negative parity states. Our model produces sensible results for pion and $\Delta$ dynamics in nuclear matter. We find a strong interplay of the $\rho$ meson and the $D_{13}(1520)$, which moves spectral strength of the $\rho$ spectrum to smaller invariant masses and leads to a broadening of the baryon resonance. The optical potential for the $\eta$ meson resulting from our model is rather attractive whereas the in-medium properties modifications of the $S_{11}(1535)$ are found to be quite small.
Leupold Stefan
Mosel Ulrich
Post Marcus
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