VECTOR POSITRONIUM STATES IN 3-DIMENSIONAL QED

The homogeneous Bethe-Salpeter equation is solved in the quenched ladd er approximation for the vector positronium states of four-component q uantum electrodynamics in two space and one time dimensions. Fermion p ropagator input is from a rainbow approximation Dyson-Schwinger soluti on, with a broad range of fermion masses considered. This work is an e xtension of earlier work on the scalar spectrum of the same model. The nonrelativistic limit is also considered via the large fermion mass l imit. Classification of states via their transformation properties und er discrete parity transformations allows analogies to be, drawn with the meson spectrum of QCD.