The calculation of bound state properties using renormalization group
techniques to compute the corresponding Regge trajectories is presented. In
particular, we investigate the bound states in different charge sectors of a
scalar theory with interaction (phi^dagger phi chi). The resulting bound state
spectrum is surprisingly rich. Where possible we compare and contrast with
known results of the Bethe-Salpeter equation in the ladder approximation and,
in the non-relativistic limit, with the corresponding Schr"odinger equation.Comment: 18 pages, 5 postscript figures, uses LaTeX2e with feynmf, amssymb and
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