[en] We study the implications of QCD - weak interference terms on vector boson peaks in two-jet and single jet cross sections and spin asymmetries in unpolarized and polarized proton-proton and antiproton-proton collisions at collider energies. It is found that the interference terms strongly influence the cross section: The vector boson peaks in proton-proton cross sections and parity violating asymmetries disappear below the interference terms at the lower energies. In antiproton-proton collisions, however, the vector boson peaks survive and measurements of parity violating spin asymmetries in double and single jet cross sections should lead to clear and detectable signals for the vector bosons. (author)