I was aware that this theory can be solved exactly and is trivial, i.e. there is no dynamics. I was also convinced that this result is due to 't Hooft. Could you confirm this view and put out some relevant refs about? Thanks beforehand. Jon
start here: A Two-Dimensional Model for Mesons. Gerard 't Hooft (CERN) . CERN-TH-1820, Feb 1974. 16pp. Published in Nucl.Phys.B75:461,1974.