CP violation in radiative Z decays
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
Published online: 27 February 2005
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.
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