  In this note, we give an explicit formula for a family of deformation
quantizations for the momentum map associated with the cotangent lift of a Lie
group action on Rd. This family of quantizations is parametrized by the formal
G-systems introduced by the authors in a previous paper and allows us to obtain
classical invariant Hamiltonians that quantize without anomalies with respect
to the quantizations of the action prescribed by the formal G-systems.
