Forward-backward asymmetry in e+e−→ννZ from anomalous CP-odd WWZ couplings

Anomalous CP-odd W+W−Z couplings can give rise to a forward-backward asymmetry in the Z angular distribution in the e+e− centre-of-mass frame in the process e+e−→ννZ. Of the three CP-odd couplings possible, only the imaginary part of one of the couplings, f4Z, which is C odd and P even, contributes to the forward-backward asymmetry. It is found that a limit of the order of 0.1 can be placed on this coupling at a Next Linear Collider with centre-of-mass energy of 500 GeV and integrated luminosity of 50 fb−1.