Quantum Interference Effects Among Helicities at LEP-II and Tevatron
  A completely model-independent method of obtaining information on the spin using the quantum interference effect among various helicity states was proposed in a recent paper. Here we point out that this effect should be demonstrable in the existing data on e^-e^+ \to W^+ W^- at LEP-II and p \bar{p} \to Z^0 + j at Tevatron. 
Matthew R. Buckley, Beate Heinemann, William Klemm, and Hitoshi   Murayama