A combined study of the gluon and ghost condensates <A^2> and   <epsilon^{abc} cbar^b c^c> in Euclidean SU(2) Yang-Mills theory in the Landau   gauge
  The ghost condensate <epsilon^{abc} cbar^b c^c> is considered together with the gluon condensate <A^2> in SU(2) Euclidean Yang-Mills theories quantized in the Landau gauge. The vacuum polarization ceases to be transverse due to the nonvanishing condensate <epsilon^{abc} cbar^b c^c>. The gluon propagator itself remains transverse. By polarization effects, this ghost condensate induces then a splitting in the gluon mass parameter, which is dynamically generated through <A^2>. The obtained effective masses are real when <A^2> is included in the analysis. In the absence of <A^2>, the already known result that the ghost condensate induces effective tachyonic masses is recovered. At the one-loop level, we find that the effective diagonal mass becomes smaller than the off-diagonal one. This might serve as an indication for some kind of Abelian dominance in the Landau gauge, similar to what happens in the maximal Abelian gauge. 
M. A. L. Capri, D. Dudal, J. A. Gracey, V. E. R. Lemes, R. F.   Sobreiro, S. P. Sorella, H. Verschelde