Two loop effective potential for < A^2_\mu > in the Landau gauge in quantum chromodynamics

Abstract

We construct the effective potential for the dimension two composite operator 1/2 A^{a 2}_\mu in QCD with massless quarks in the Landau gauge for an arbitrary colour group at two loops. For SU(3) we show that an estimate for the effective gluon mass decreases as N_f increases.

Comments: 17 latex pages