A test of gauge nature of the W boson in the reaction e+e-->Zγ

I propose a new method to measure the magnetic moment parameter theta of the charged intermediate weak boson. T-odd asymmetries in the angular distribution of the secondary lepton in the process e+e-->Zγ, Z->lanti l are very sensitive to K. The asymmetries are calculated in the lowest order from the absorptive part of one-loop diagrams. (orig.)