Unified algebraic treatment of resonance

Energy resonance in scattering is usually investigated either directly in the complex energy plane (E-plane) or indirectly in the complex angular momentum plane (l-plane). Another formulation complementing these two approaches was introduced recently. It is an indirect algebraic method that studies resonances in a complex charge plane (Z-plane). This latter approach will be generalized to provide a unified algebraic treatment of resonances in the complex E-, l-, and Z-planes. The complex scaling (rotation) method will be used in the development of this approach. The resolvent operators (Green's functions) axe formally defined in these three spaces. Bound states spectrum and resonance energies in the E-plane axe mapped onto a discrete set of poles of the respective resolvent operator on the real line of the l- and Z-planes. These poles move along trajectories as the energy is varied. A finite L-2 basis is used in the numerical implementation of this approach. Stability of poles and trajectories against variation in all computational parameters is demonstrated. Resonance energies for a given potential axe calculated and compared with those obtained by other studies.