Comparison of (N)over-barN optical models

We, compare the strong part of the (N) over barN interaction obtained by the Nijmegen partial wave analysis and the results of some of the most popular (N) over barN optical potentials in configuration space. We have found severe discrepancies in most of the partial waves, especially above p(Lab) = 400 MeV/c where the partial wave analysis displays a resonant-like structure in the S-31(0) and P-33(0) waves. Some theoretical difficulties to interpret this behaviour in terms of dynamical resonances are pointed pout and an alternative explanation is suggested. A much better stability is observed in the low energy parameters, apart from some discrepancies due to the presence of near-threshold quasi-bound states in particular waves. Large deviations have also been found between the corresponding potentials, at short and medium-range (r greater than or similar to 1 fm) distances.