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We use nucleon-nucleon phase shifts obtained from experimental data, togetherwith the chiral expansion for the long-distance part of the NN interaction, toobtain information about the short-distance piece of the NN potential that isat work in the 1S0 channel. We find that if the scale R that defines theseparation between "long-" and "short-" distance is chosen to be \lsim 1.8 fmthen the energy dependence produced by short-distance dynamics is wellapproximated by a two-term polynomial for Tlab < 200 MeV. We also find that aquantitative description of NN dynamics is possible, at least in this channel,if one treats the long-distance parts of the chiral NN potential inperturbation theory. However, in order to achieve this we have to choose aseparation scale R that is larger than 1.0 fm.

Chiral potentials, perturbation theory, and the 1S0 channel of NN scattering