Nuclear forces with Δ excitations up to next-to-next-to-leading order,part I: Peripheral nucleon-nucleon waves |
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Authors: | H. Krebs E. Epelbaum U. -G. Meißner |
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Affiliation: | 1.Forschungszentrum Jülich,Institut für Kernphysik (Theorie),Jülich,Germany;2.Universit?t Bonn,Helmholtz-Institut für Strahlen- und Kernphysik (Theorie),Bonn,Germany |
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Abstract: | We study the two-nucleon force at next-to-next-to-leading order in a chiral effective field theory with explicit Δ degrees of freedom. Fixing the appearing low-energy constants from a next-to-leading-order calculation of pion-nucleon threshold parameters, we find an improved convergence of most peripheral nucleon-nucleon phases compared to the theory with pions and nucleons only. In the delta-full theory, the next-to-leading-order corrections are dominant in most partial waves considered. |
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Keywords: | 13.75.Cs Nucleon-nucleon interactions (including antinucleons, deuterons, etc.) 21.30.-x Nuclear forces |
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