The Two-nucleon system at next-to-next-to-next-to-leading order

By Evgeny Epelbaum, W. Glöckle, U. Meissner. 2004

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Abstract We consider the two-nucleon system at next-to-next-to-next-to-leading order (N 3 LO) in chiral effective field theory. The two-nucleon potential at N 3 LO consists of one-, two- and three-pion exchanges and a set of contact interactions with zero, two and four derivatives. In addition, one has to take into account various isospin-breaking and relativistic corrections. We employ spectral function regularization for the multi-pion exchanges. Within this framework, it is shown that the three-pion exchange contribution is negligibly small. The low-energy constants (LECs) related to pion–nucleon vertices are taken consistently from studies of pion–nucleon scattering in chiral perturbation theory. The total of 26 four-nucleon LECs has been determined by a combined fit to some np and pp phase shifts from the Nijmegen analysis together with the nn scattering length. The description of nucleon–nucleon scattering and the deuteron observables at N 3 LO is improved compared to the one at NLO and NNLO. The theoretical uncertainties in observables are estimated based on the variation of the cut-offs in the spectral function representation of the potential and in the regulator utilized in the Lippmann–Schwinger equation.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/3a2014bf41ef2ecac649615f14d0b182c0fd6411

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In Nuclear and High Energy Physics

  1. P. Reinert
  2. Hermann Krebs
  3. Evgeny Epelbaum
  4. H. Hergert
  5. H. Hammer

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