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Nucleon-nucleon interaction is studied using relativistic form of the chiral Lagrangian. Partialwave amplitudes are computed in chiral perturbation theory at next-to-next-to-leadingorder in the subthreshold region. The most general constraints set by analyticity and unitarity are implemented to extrapolate the amplitudes into the physical region. Empirical phase shifts are described up to laboratory energies Tlab ≃ 250 MeV. The issues related with renormalization and convergence of perturbation theory are investigated.

Chiral two-nucleon dynamics, analyticity and dispersion relations