Nucleon–nucleon resonances at intermediate energies using a complex energy formalism

We apply our method of complex scaling, valid for a general class of potentials, in a search for nucleon–nucleon S-matrix poles up to 2 GeV laboratory kinetic energy. We find that the realistic potentials JISP16, constructed from inverse scattering, and chiral field theory potentials N3LO and N2LOopt support resonances in energy regions well above their fit regions. In some cases these resonances have widths that are small when compared with the real part of the S-matrix pole.