CP violating effects in the decay Z→μ+μ−γ induced by ZZγ and Zγγ couplings

We analyze possible CP-violating effects induced in the Z decay with hard photon radiation by γZZ and γγZ anomalous vertices. We estimate the sensibility of future linear collider experiments on these couplings coming from CP-odd asymmetries associated to angular correlations of the three particle final state in e+e−→Z→μ+μ−γ. We find that a linear collider with an integrated luminosity of 500fb−1 and s=0.05TeV can place the bound |h1γ,Z|<0.92 at the 90% confidence level for these couplings.