Meson spectroscopy and separable potentials

Coupled channel formalism for unequal masses of interacting mesons has been developed using the separable interactions. The scattering amplitudes and the corresponding channel integrals have been calculated. A practical method to determine the potential parameters from the positions of resonances in the complex energy plane has been formulated. The two-channel formalism has been extended to three interacting channels. A useful parametrization of the 3 x 3 S-matrix in terms of phase shifts and inelasticity parameters has been written. (author)