Another look at Z→ll-barγ decay

We first make some comments on the angular distribution of the photon observed in the anomalous Z→ll-barγ decay, and then calculate explicitly the lowest-order one-loop contribution within the standard electroweak model. It is finally pointed out that, possibly in some composite models with hyperstrong coupling, large electromagnetic moments for Z may exist to accommodate the anomalous decay rate without violating the present accuracy of the g-2 factors of the electron and muon