MESON-MESON SCATTERING PHASE-SHIFTS IN (2-DIMENSIONAL LATTICE QED(1))

The mass spectrum of a meson-meson system in compact three-dimensional lattice quantum electrodynamics is computed from a time correlation m atrix with staggered fermions. The energy levels indicate a slightly a ttractive residual interaction between the mesons. From the finite-vol ume spectrum scattering phase shifts within the various irreducible re presentations of the (cubic, d = 2) lattice symmetry group are extract ed. The s-wave (l = 0) phase shifts are consistent with repulsion at s mall relative distance. The d-wave (l = 2) data indicate intermediate- range attraction.