Photoabsorption off nuclei with self consistent vertex corrections

Details Photoabsorption off nuclei with self consistent vertex corrections Photoabsorption off nuclei with self consistent vertex corrections

2008-09-26

arxiv.org/abs/0809.4608v1

Phys.Rev.C80:024902,2009

Physics

Nuclear Physics

Nuclear Theory

10 pages, 6 figures

Scientific paper

10.1103/PhysRevC.80.024902

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.

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