Possible anomalous ZZγ and Zγγ couplings and Z boson spin orientation in e+e→Zγ

A method based on a general relativistic spin-1 density matrix formalism has been used to find analytically the possible CP-conserving anomalous ZZgamma and Zgammagamma couplings corrections to the polarization vector and the alignment tensor for the Z boson in the process e(+)e(-) --> Zgamma with longitudinally polarized initial beams. The role of longitudinal polarization of the initial beams for disentangling different sets of couplings has been analysed. (C) 2004 Elsevier B.V. All rights reserved.