Nuclear forces with Δ excitations up to next-to-next-to-leading order, part I: Peripheral nucleon-nucleon waves

H. Krebs; E. Epelbaum; U. -G. Meißner

doi:10.1140/epja/i2007-10372-y

EPJ

Nuclear forces with Δ excitations up to next-to-next-to-leading order, part I: Peripheral nucleon-nucleon waves

H. Krebs¹^,2, E. Epelbaum¹^,2^* and U. -G. Meißner¹^,2

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 –

23rd International Summer School on Vacuum, Electron, and Ion Technologies (VEIT)
18-22 September 2023
Sozopol, Bulgaria

EPJ

Nuclear forces with Δ excitations up to next-to-next-to-leading order, part I: Peripheral nucleon-nucleon waves

Conference announcements