Eur. Phys. J. C (1998) 1: 191-199
https://doi.org/10.1007/BF01245808

CP violation in radiative Z decays

¹ Physics Department, University of Oxford, Clarendon Laboratory, Parks Road, OX1 3PU, Oxford, UK
² Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, D-69120, Heidelberg, Germany

Received: 4 March 1997
Published online: 27 February 2005

Abstract

We propose to test the CP symmetry in the reactions Z → μ⁺μ⁻γ and Z → τ⁺τ⁻γ. The experimental analysis of angular correlations allows to determine a set of effective couplings: the electric and weak dipole moments of the muon and the tau lepton, and in particular chirality conserving 4-particle couplings, all of which can be induced by CP-violation in renormalizable theories of electroweak interactions beyond the Standard Model. We update an indirect bound on the weak dipole moment of the muon.