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Peripheral NN-Scattering: Role of Delta-Excitation, Correlated Two-Pion and Vector Meson Exchange | | N. Kaiser
; S. Gerstendoerfer
; W. Weise
; | | Date: |
24 Feb 1998 | | Journal: | Nucl.Phys. A637 (1998) 395-420 | | Subject: | nucl-th | | Abstract: | We evaluate, within one-loop chiral perturbation theory, the two-pion exchange diagrams with single and double delta-isobar excitation contributing to elastic NN-scattering. We find that virtual $Delta$-excitation processes (in the static limit) produce the correct amount of isoscalar central attraction as needed in the peripheral partial waves with $Lgeq 3$. Furthermore we compute the two-loop diagrams involving the $pipi$-interaction (so-called correlated $2pi$-exchange). Contrary to common believe these processes lead to negligibly small and repulsive corrections to the NN-potential. The exchange of vector mesons ($
ho, omega$) turns out to be important for the F-wave phase shifts above $T_{lab}=150$ MeV. Without adjustable parameters we are able to reproduce the empirical NN phase shifts up to 350 MeV for $Lgeq 3$ and up to about (50--80) MeV for the D-waves. This is therefore the characteristic window in which the NN-interaction is basically governed by chiral symmetry. Not surprisingly, the lower partial waves require non-perturbative methods and additional short-distance parametrizations of the NN-dynamics. | | Source: | arXiv, nucl-th/9802071 | | Services: | Forum | Review | PDF | Favorites | |
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