Nucleon mass and pion loops: Renormalization

Details Nucleon mass and pion loops: Renormalization Nucleon mass and pion loops: Renormalization

2002-03-27

arxiv.org/abs/nucl-th/0203073v1

Phys.Rev.C66:065207,2002

Physics

Nuclear Physics

Nuclear Theory

14 pages, 6 figures

Scientific paper

10.1103/PhysRevC.66.065207

Using Dyson--Schwinger equations, the nucleon propagator is analyzed nonperturbatively in a field--theoretical model for the pion--nucleon interaction. Infinities are circumvented by using pion--nucleon form factors which define the physical scale. It is shown that the correct, finite, on--shell nucleon renormalization is important for the value of the mass--shift and the propagator. For physically acceptable forms of the pion--nucleon form factor the rainbow approximation together with renormalization is inconsistent. Going beyond the rainbow approximation, the full pion--nucleon vertex is modelled by its bare part plus a one--loop correction including an effective $\Delta$. It is found that a consistent value for the nucleon mass--shift can be obtained as a consequence of a subtle interplay between wave function and vertex renormalization. Furthermore, the bare and renormalized pion--nucleon coupling constant are approximately equal, consistent with results from the Cloudy Bag Model.

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