Towards finding the single-particle content of two-dimensional adjoint QCD

The single-particle content of two-dimensional adjoint QCD remains elusive due to the inability to distinguish single-from multiparticle states. To find a criterion we compare several approximations to the theory. The starting point is a Hamiltonian containing only operators corresponding to the long-range Coulomb forces. This enables us to construct sets of eigenfunctions in the lowest parton sectors. A perturbative treatment of the omitted operators is then performed. We find that multiparticle states are absent if pair production is disallowed and hints for a double "Regge" trajectory of single-particle states. We discuss the structure of the eigensystem of the theory, and present the reason for the fact that bosonic single-particle states do not form multiparticle states.