Soft two-meson-exchange nucleon-nucleon potentials. II. One-pair and two-pair diagrams

Details Soft two-meson-exchange nucleon-nucleon potentials. II. One-pair and two-pair diagrams Soft two-meson-exchange nucleon-nucleon potentials. II. One-pair and two-pair diagrams

1995-09-19

arxiv.org/abs/nucl-th/9509031v2

Phys.Rev.C54:2869-2882,1996

Physics

Nuclear Physics

Nuclear Theory

21 pages RevTeX, 7 postscript figures; revised version as to appear in Phys. Rev. C

Scientific paper

10.1103/PhysRevC.54.2869

Two-meson-exchange nucleon-nucleon potentials are derived where either one or both nucleons contains a pair vertex. Physically, the meson-pair vertices are meant to describe in an effective way (part of) the effects of heavy-meson exchange and meson-nucleon resonances. {}From the point of view of ``duality,'' these two kinds of contribution are roughly equivalent. The various possibilities for meson pairs coupling to the nucleon are inspired by the chiral-invariant phenomenological Lagrangians that have appeared in the literature. The coupling constants are fixed using the linear $\sigma$ model. We show that the inclusion of these two-meson exchanges gives a significant improvement over a potential model including only the standard one-boson exchanges.

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