https://doi.org/10.1140/epja/i2007-10372-y
Regular Article - Nuclear Structure and Reactions
Nuclear forces with Δ excitations up to next-to-next-to-leading order, part I: Peripheral nucleon-nucleon waves
1
Forschungszentrum Jülich, Institut für Kernphysik (Theorie), D-52425, Jülich, Germany
2
Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik (Theorie), D-53115, Bonn, Germany
Received:
19
April
2007
Accepted:
23
April
2007
Published online:
23
May
2007
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.
PACS: 13.75.Cs Nucleon-nucleon interactions (including antinucleons, deuterons, etc.) – / 21.30.-x Nuclear forces –
© Società Italiana di Fisica and Springer-Verlag 2007
