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Long-range contributions to the three-nucleon force that have been recentlyworked out in chiral effective field theory at next-to-next-to-next-to-leadingorder are for the first time included in the triton and the doubletnucleon-deuteron scattering length calculations. The strengths of the twoshort-range terms available at this order in the chiral expansion aredetermined from the triton binding energy and the neutron-deuteron doubletscattering length. The structure of the resulting three-nucleon force isexplored and effects for the two-nucleon correlation function in the triton areinvestigated. Expectation values of the individual contributions to thethree-nucleon force in the triton are found to be in the range from a few 100keV to about 1 MeV. Our study demonstrates that the very complicated operatorstructure of the novel chiral three-nucleon forces can be successivelyimplemented in three-nucleon Faddeev calculations.

The triton with long-range chiral N3LO three nucleon forces