  The flow-equation method of continuous unitary transformations is used to
eliminate the minimal quark-gluon interaction in the light-front quantized QCD
Hamiltonian. The coupled differential equations in the two lowest Fock sectors
correspond to the renormalization of the light-front gluon mass and the
generation of an effective quark-antiquark (as well as gluon-gluon)
interaction. The original gauge field coupling is completely eliminated, even
in the presence of degenerate states connected by this interaction. Further, a
more singular $1/q^4$ behavior for the quark and gluon effective interactions
at small gluon momenta is obtained, due to the asymptotic behavior of the
effective gluon mass for small cutoff. We discuss the consequences of this
asymptotic behavior and possible confinement implications.
