Calculation of resonances in the Coulomb three-body system with two   disintegration channels in the adiabatic hyperspherical approach
  The method of calculation of the resonance characteristics is developed for the metastable states of the Coulomb three-body (CTB) system with two disintegration channels. The energy dependence of K-matrix in the resonance region is calculated with the use of the stabilization method. Resonance position and partial widths are obtained by fitting the numerically calculated K(E)-matrix with the help of the generalized Breit-Wigner formula. 
D.I. Abramov, V.V. Gusev