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The strong-coupling theory in static models is formulated in terms of functional integrations. The method is demonstrated for the charged-scalar model. The expression of elastic and inelastic meson-nucleon scattering amplitudes is obtained to leading order in the strong-coupling expansion 1/g expansion), while the isobar energy levels are obtained up to the next to the leading order.
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Branco et al. (1974) studied this question.
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