Two-pion exchange potential and the $πN$ amplitude

Details Two-pion exchange potential and the $πN$ amplitude Two-pion exchange potential and the $πN$ amplitude

1996-05-30

arxiv.org/abs/nucl-th/9605041v1

Phys.Rev.C54:2235-2239,1996

Physics

Nuclear Physics

Nuclear Theory

9 pages (RevTex) and 7 postscript figures, in one uuencoded gzipped tar file

Scientific paper

10.1103/PhysRevC.54.2235

We discuss the two-pion exchange potential which emerges from a box diagram with one nucleon (the spectator) restricted to its mass shell, and the other nucleon line replaced by a subtracted, covariant $\pi N$ scattering amplitude which includes $\Delta$, Roper, and $D_{13}$ isobars, as well as contact terms and off-shell (non-pole) dressed nucleon terms. The $\pi N$ amplitude satisfies chiral symmetry constraints and fits $\pi N$ data below $\sim$ 700 MeV pion energy. We find that this TPE potential can be well approximated by the exchange of an effective sigma and delta meson, with parameters close to the ones used in one-boson-exchange models that fit $NN$ data below the pion production threshold.

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