title: Hadronic bound states in SU(2) from Dyson-Schwinger equations.
abstract: By using the Dyson-Schwinger/Bethe-Salpeter formalism in Euclidean spacetime, we calculate the ground state spectrum of [Formula: see text] hadrons in an SU(2) gauge theory with two fundamental fermions. We show that the rainbow-ladder truncation, commonly employed in QCD studies, is unsuitable for a description of an SU(2) theory. This we remedy by truncating at the level of the quark-gluon vertex Dyson-Schwinger equation in a diagrammatic expansion. Results obtained within this novel approach show good agreement with lattice studies. These findings emphasize the need to use techniques more sophisticated than rainbow-ladder when investigating generic strongly interacting gauge theories.
authors.affiliation: Institut für Physik, Karl-Franzens-Universität Graz, Universitätsplatz 5, 8010 Graz, Austria.
authors.forename: Milan
authors.initials: M
authors.lastname: Vujinovic
authors.affiliation: Institut für Theoretische Physik, Justus-Liebig-Universität Giessen, 35392 Giessen, Germany.
authors.forename: Richard
authors.initials: R
authors.lastname: Williams