Antinucleon-nucleon potential

A coupled-channels model for antinucleon-nucleon ($\overline{N}N$) scattering is presented. The $\overline{N}N$ channels are coupled to effective two-particle annihilation channels. The neutron-proton mass difference and the Coulomb interaction are taken exactly into account. This model gives a detailed fit to a set of 977 $\overline{N}N$ scattering data up to $T_{\mathrm{lab}}=482\mathrm{}$ MeV, with an overall $\frac{{\chi }^2}{\mathrm{data}}=1.39\mathrm{}$. The potentials are found to be long-ranged. A discussion of several experimental data sets and of the influence of the Coulomb interaction is given.