The European Physical Journal C

ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)

Table of Contents

Abstract Volume 1 Issue 1/2 (1998) pp 191-199

theoretical physics:
CP violation in radiative Z decays

D. Bruß (1), O. Nachtmann (2), P. Overmann (2)

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

Received: 4 March 1997

Abstract. We propose to test the CP symmetry in the reactions ${\rm Z}\to\mu^+\mu^-\gamma$ and ${\rm Z}\to\tau^+\tau^-\gamma$. 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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Online publication: December 11, 1997
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