On the Landau Background Gauge Fixing and the IR Properties of YM Green   Functions
  We analyse the complete algebraic structure of the background field method for Yang--Mills theory in the Landau gauge and show several structural simplifications within this approach. In particular we present a new way to study the IR behavior of Green functions in the Landau gauge and show that there exists a unique Green function whose IR behaviour controls the IR properties of the gluon and the ghost propagators. 
Pietro A. Grassi (YITP, Stony Brook & Piem. Orien. U. & IHES), T.   Hurth (CERN & SLAC), and A. Quadri (MPI, Munich)