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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Th. Walcher
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Krebs, H., Epelbaum, E. & Meißner, U.G. Nuclear forces with Δ excitations up to next-to-next-to-leading order, part I: Peripheral nucleon-nucleon waves. Eur. Phys. J. A 32, 127–137 (2007). https://doi.org/10.1140/epja/i2007-10372-y
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DOI: https://doi.org/10.1140/epja/i2007-10372-y