Chiral partners and their electromagnetic radiation (Ingredients for a systematic in-medium calculation) |
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Authors: | S. Leupold M.F.M. Lutz |
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Affiliation: | a Johann Wolfgang Goethe-Universität Frankfurt, Germany b GSI Darmstadt, Germany c Justus-Liebig-Universität Giessen, Germany |
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Abstract: | It is argued that the chiral partners of the lowest-lying hadrons are hadronic molecules and not three-quark or quark-antiquark states, respectively. As an example the case of a1 as the chiral partner of the ρ is discussed. Deconfinement-or as a precursor large in-medium widths for hadronic states-is proposed as a natural way to accommodate for the fact that at chiral restoration the respective in-medium spectra of chiral partners must become degenerate. Ingredients for a systematic and self-consistent in-medium calculation are presented with special emphasis on vector-meson dominance which emerges from a recently proposed systematic counting scheme for the mesonic sector including pseudoscalar and vector mesons as active degrees of freedom. |
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Keywords: | Chiral symmetry Hadron molecules Chiral restoration Vector-meson dominance |
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