Abstract
First, a historical overview is presented concerning the use of QCD sum rules to learn about the p-meson properties at finite nuclear densities. Second, it is shown that the combination of the sum rule technique with the large-N c expansion provides new insight. Especially it is possible to determine from the in-medium sum rules a vacuum(!) quantity which is an important ingredient for hadronic in-medium calculations of the p-meson spectral function. This quantity is the coupling strength of the p-nucleon system to the baryonic resonance N*(1520).
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Leupold, S. What QCD sum rules tell about the rho meson — A new answer to an old question. Acta Phys. Hung. A 22, 207–214 (2005). https://doi.org/10.1556/APH.22.2005.3-4.5
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DOI: https://doi.org/10.1556/APH.22.2005.3-4.5