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 narrow when
compared with the real part of the S-matrix pole.Comment: 7 pages, 5 figures, 2 Table