Use of even Grassmann variables to construct effective actions for mesons
arXiv:hep-lat/9802002 · doi:10.1016/S0920-5632(97)00901-8
Abstract
A quadratic action in even Grassmann variables with the quantum numbers of the pions has been studied. It includes the $Ï$-field in order to be invariant under SU(2)_L times SU(2)_R transformations over the quarks. This action exhibits the Goldstone phenomenon reducing its symmetry to the O(3) isospin invariance. The model has been investigated in the Stratonovitch-Hubbard representation, in which form it is reminiscent of the Gell-Mann-Levy model. By the saddle point method a renormalizable expansion in inverse powers of the index of nilpotency of the mesonic fields (which is 24), is generated. The way it might be used in a new perturbative approach to QCD is outlined.
Talk presented at Lattice '97 (Theoretical Developments), Edinburgh (UK), July 1997. LaTeX2e, 3 pages, uses espcrc2