Abstract
We study particle-antiparticle bound states in the scalar Yukawa (Wick-Cutkosky) model, using the variational method in the Hamiltonian formalism of quantum field theory. Covariant Green's functions are used to solve for the mediating field in terms of the particle fields. A trial state, containing one and two particle-antiparticle Fockspace components is used to calculate the ground state mass of the particle-antiparticle system. We compare our results with earlier calculations.
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