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29 March 2024
 
  » arxiv » nucl-th/0309085

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Hadronic Spectral Functions in Nuclear Matter
M. Post ; S. Leupold ; U. Mosel ;
Date 30 Sep 2003
Journal Nucl.Phys. A741 (2004) 81-148
Subject nucl-th
AbstractWe study the in-medium properties of mesons $(pi,eta, ho)$ 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 $ ho$ meson and the $D_{13}(1520)$, which moves spectral strength of the $ ho$ 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.
Source arXiv, nucl-th/0309085
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