Operator ordering and Feynman rules in gauge theories

The ordering of operators in the Yang-Mills Hamiltonian is determined for the V₀=0 gauge and for a general noncovariant gauge (V₈) =0, with a linear function of the spatial components of the gauge field V_. We show that a Cartesian ordering of the V₀=0 gauge Hamiltonian defines a quantum theory equivalent to that of the usual, covariant-gauge Feynman rules. However, a straightforward change of variables reduces this V₀=0 gauge Hamiltonian to a (V₈) =0 gauge Hamiltonian with an unconventional operator ordering. The resulting Hamiltonian theory, when translated into Feynman graphs, is shown to imply new nonlocal interactions, even in the familiar Coulomb gauge.