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Within a covariant Bethe-Salpeter approach, the relativistic complexseparable neutron-proton interaction kernel is proposed. The uncoupledpartial-wave states with the total angular momentum $J$=0,1 are considered. Themultirank separable potentials elaborated earlier are real-valued and,therefore, enable to describe the elastic part (phase shifts, low-energyparameters, etc.) of the scattering only. The description of the inelasticityparameter comes out of the imaginary part introduced into them. To obtainparameters of the complex potentials the elastic neutron-proton scatteringexperimental data up to 3 GeV are used. A signal of dybaryon resonances in the$^3P_0^+$ partial-wave state is discussed.

Relativistic separable interaction kernel of the neutron-proton system with inelasticities