The spectrum of states with one current acting on the adjoint vacuum of massless QCD2

We consider a 'one current' state, which is obtained by the application of a color current on the 'adjoint' vacuum. This is done in QCD2, with the underlying quarks in the fundamental representation. The quarks are taken to be massless, in which case the theory on the light-front can be 'currentized', namely, formulated in terms of currents only. The adjoint vacuum is shown to be the application of a current derivative, at zero momentum, on the singlet vacuum. We apply the operator M2=2P+P- on these states and find that in general they are not eigenstates of M2 apart from the large Nf limit. Problems with infra-red regularizations are pointed out. We discuss the fermionic structure of these states