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An $\bar N$ N  potential is reviewed which has been derived within chiral effective field theory by the Jülich-Bonn group. By construction it reproduces $\bar N$ N  phase shifts and inelasticities, provided by an elaborate phase-shift analysis of available $\bar p$ p  scattering data. This interaction is then employed in a study of neutron-antineutron oscillations in the deuteron. In particular, the deuteron lifetime is considered, and results for it are presented in terms of the free-space  n  – $\bar n$ oscillation time, based on that $\bar N$ N  potential in combination with an  NN  interaction likewise derived within chiral effective field theory.

Antinucleon-nucleon interaction from chiral effective field theory and its application to neutron-antineutron oscillations