Energies and widths of Efimov states in the three-boson continuum

Understand

Three-boson Efimov physics is well known in the bound-state regime, but far less in the three-particle continuum at negative two-particle scattering length where Efimov states evolve into resonances.

• They are studied solving rigorous three-particle scattering equations for transition operators in the momentum space.
• The dependence of the three-boson resonance energy and width on the two-boson scattering length is studied with several force models.
• The universal limit is determined numerically considering highly excited states; simple parametrizations for the resonance energy and width in terms of the scattering length are established.