Forward-backward asymmetry in e+e- -> nu nubar Z from anomalous CP-odd WWZ couplings

Abstract

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- -> nu nubar Z. Of the three CP-odd couplings possible, only the imaginary part of one of the couplings, f_4^Z, 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}.

Comments: 8 pages, latex, 3 figures, included as postscript files. Revised version, containing an extra paragraph and an additional reference, is the form accepted for publication in Phys. Lett. B