A novel renormalizable representation of the Yang-Mills theory

For a generic gauge-invariant correlator <{\cal Q}[A_{\mu}]>_{A}, we reformulate the standard D=4 Yang-Mills theory as a renormalizable system of two interacting fields a_{\mu} and B_{\mu} which faithfully represent high- and low-energy degrees of freedom of the single gauge field A_{\mu} in the original formulation. It opens a possibility to synthesize an infrared-nonsingular weak-coupling series, employed to integrate over a_{\mu} for a given background B_{\mu}, with qualitatively different methods. These methods are to be applied to evaluate the resulting (after the a_{\mu}-integration) representation of <{\cal Q}[A_{\mu}]>_{A} in terms of gauge-invariant generically non-local low-energy observables, like Wilson loops. The latter observables are averaged over B_{\mu} with respect to a gauge-invariant Wilsonean effective action S_{eff}[B]. To avoid a destructive dissipation between the high- and low-energy excitations, we implement a specific fine-tuning of the interaction between the pair of the fields: prior to the integration over B_{\mu}, the expectation value <a_{\mu}>_{a} vanishes, in the tree order of the loop-wise expansion, for an arbitrary configuration of B_{\mu}.