2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/58223We consider the analytic continuation of the transfer function for a 2x2 matrix Hamiltonian into the unphysical sheets of the energy Riemann surface. We construct non-selfadjoint operators representing operator roots of the transfer function which reproduce certain parts of its spectrum including resonances situated in the unphysical sheets neighboring the physical sheet. On this basis, completeness and basis properties for the root vectors of the transfer function (including those for the resonances) are proved.LaTeX, 8 pages, no figures; Contribution to Proceedings of the Conference ``Mathematical Results in Quantum Mechanics (QMath7)'', Prague, June 22-26, 1998. Published version of the paperMathematical PhysicsHigh Energy Physics - PhenomenologyNuclear TheoryPrimary 47A56, 47Nxx; Secondary 47N50, 47A40text