Scattering of Glueballs and Mesons in Compact $QED$ in $2+1$ Dimensions
  We study glueball and meson scattering in compact $QED_{2+1}$ gauge theory in a Hamiltonian formulation and on a momentum lattice. We compute ground state energy and mass, and introduce a compact lattice momentum operator for the computation of dispersion relations. Using a non-perturbative time-dependent method we compute scattering cross sections for glueballs and mesons. We compare our results with strong coupling perturbation theory. 
A.M. Chaara, H. Kr\"oger, L. Marleau, K.J.M. Moriarty and J. Potvin