Spin Zero Glueballs in the Bethe-Salpeter Formalism
  The Schwinger-Dyson Bethe-Salpeter approach to the bound state problem is applied to the spin zero glueball spectrum. Although a moderately successful description of the two point functions and the glueball spectrum can be obtained, further work is required to reduce sensitivity to model truncations. 
Joseph Meyers and Eric S. Swanson
hep-ph