Off-shell Jost function for a superposition of Yukawa potentials

Integral representations for the s-wave, off-shell Jost function and half-off-shell T matrix for a superposition of Yukawa potentials are derived. A representation for the form factor or vertex function associated with a bound state or resonance produced by such a potential is also derived. The analytic structure of the various functions is discussed. The applicability of the form factor result to the S01 virtual bound state of the two-nucleon system is pointed out, and a calculation of the form factor for the S01 Reid potential is presented. NUCLEAR REACTIONS Off-shell Jost function, T matrix, and form factor for a superposition of Yukawa potentials; application to S01 Reid potential.