Abstract
We formulate the strong-coupling theory for a system of a point particle interacting with a neutral scalar field in two-dimensional spacetime, treating the degree of freedom of the point particle rigorously. It is shown that the strong-coupling expansion (1/g expansion) becomes possible if the mass of the point particle is of order g/sup 2/. Higher-order corrections to the energy and the elastic point-particle--meson scattering amplitude are obtained to leading order.
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