In a toy Hamiltonian effective field theory with one bare state and one scattering channel, a bound or resonant pole always forms near the bare-state mass, and the number of T-matrix poles grows with the form-factor power.
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The Study of Pole Trajectory within a bare state in the coupled channel model
In a toy Hamiltonian effective field theory with one bare state and one scattering channel, a bound or resonant pole always forms near the bare-state mass, and the number of T-matrix poles grows with the form-factor power.