The non-perturbative groundstate of QCD and the local composite operator Aμ2

We investigate the possibility that the dimension 2 condensate A(mu)(2) has a non zero non-perturbative value in Yang-Nulls theory. A We introduce a multiplicatively renormalisable effective potential for this condensate and show through two loop calculations that a non zero condensate is energetically favoured. (C) 2001 Elsevier Science B.V. All rights reserved.