Photoabsorption off nuclei with self-consistent vertex corrections

F. Riek, M. F.M. Lutz, C. L. Korpa

Research output: Article

11 Citations (Scopus)


We study photoproduction off nuclei based on a self-consistent and covariant many-body approach for the pion and isobar propagation in infinite nuclear matter. For the first time the t-channel exchange of an in-medium pion is evaluated in the presence of vertex correction effects consistently. In particular the interference pattern with the s-channel in-medium nucleon and isobar exchange contribution is considered. Electromagnetic gauge invariance is kept as a consequence of various Ward identities obeyed by the computation. Adjusting the set of Migdal parameters to the data set we predict an attractive mass shift for the isobar of about 50 MeV at nuclear saturation density.

Original languageEnglish
Article number024902
JournalPhysical Review C - Nuclear Physics
Issue number2
Publication statusPublished - aug. 7 2009

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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