The three- and four-nucleon systems from chiral effective field theory
E. Epelbaum, H. Kamada, A. Nogga, H. Witala, W. Glöckle, Ulf-G. Meißner
Abstract
Recently developed chiral nucleon-nucleon (NN) forces at next-to-leading order (NLO) that describe NN phase shifts up to about 100 MeV fairly well have been applied to 3N and 4N systems. Faddeev-Yakubovsky equations have been solved rigorously. The chiral NLO forces depend on a momentum cut-off Λlying between 540-600 MeV/c. The resulting 3N and 4N binding energies are in the same range as found using standard NN potentials. In additon, low-energy 3N scattering observables are very well reproduced like for standard NN forces. Surprisingly, the long standing Ay-puzzle is resolved at NLO. The cut-off dependence of the scattering observables is rather mild.
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