Below are plots taken from sample MC data (10**5 evts) of ZZ pair production and decay to 4 leptons with and without anomalous couplings, f_4 and f_5 in the standard notation of Hagiwara et. al., in which we have done the calculation with the Monte Carlo YFSZZ, which includes YFS exponentiation of the initial state radiative multiple photon effects. We show in the figure the respective total cross section and the Z production angle distribution for the case of SM couplings(f_4=f_5=0) and for the case that f_4=f_5= 0.01 for illustration. The results show the differential realization of the nonzero f_4,f_5 in the presence of multiple photon effects. A detailed discussion of them and related results will appear elsewhere{S. Jadach et al., to appear}.
Differential and total cross sections for ZZ production at 500 GeV