The European Physical Journal C

, Volume 1, Issue 1–2, pp 191–199 | Cite as

CP violation in radiative Z decays

  • D. Bruß
  • O. Nachtmann
  • P. Overmann
Article
First Online:
Received:

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.

Keywords

Electric Dipole Moment Monte Carlo Event Generator Opal Collab Optimal Observable Excited Lepton 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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References

  1. 1.
    J.F.Donoghue, B.R.Holstein, G.Valencia: Int.J.Mod.Phys.A2, 319 (1987)ADSCrossRefGoogle Scholar
  2. 2.
    W.Bernreuther, U.Löw, J.P.Ma, O.Nachtmann: Z.Phys.C43, 117 (1989)ADSGoogle Scholar
  3. 3.
    W.Bernreuther, O.Nachtmann: Phys.Rev.Lett63, 2787 (1989)ADSCrossRefGoogle Scholar
  4. 3a.
    , O.Nachtmann: Phys.Rev.Lett E:64, 1072 (1990)ADSCrossRefGoogle Scholar
  5. 4.
    J.Körner, J.P.Ma, R.Münch, O.Nachtmann, R.Schöpf: Z. Phys.C49, 447 (1991)Google Scholar
  6. 5.
    W. Bernreuther, G.W. Botz, O.Nachtmann, P.Overmann: Z. Phys.C52, 567 (1991)ADSGoogle Scholar
  7. 6.
    W.Bernreuther, O.Nachtmann: Phys.Lett.B268, 424 (1991)ADSCrossRefGoogle Scholar
  8. 7.
    W.Bernreuther, O.Nachtmann, P.Overmann: Phys.Rev.D48, 78 (1993)ADSGoogle Scholar
  9. 8.
    W.Bernreuther, G.W.Botz, D.Bruß, P.Haberl, O.Nachtmann: Z.Phys.C68, 73 (1995)ADSGoogle Scholar
  10. 9.
    P. Haberl: “CP violating couplings in Z → 3 jets revisited”, eprint hep-ph/9611430Google Scholar
  11. 10.
    A.De Rujula, M.B.Gavela, O.Pene, F.J.Vegas: Nucl.Phys.B357, 311 (1991)ADSCrossRefGoogle Scholar
  12. 11.
    K.J.Abraham, B.Lampe: Phys. Lett.B326, 175 (1994)ADSCrossRefGoogle Scholar
  13. 12.
    W.Bernreuther, O.Nachtmann: “Some Remarks on the Search for CP Violation in Z-Decays”, eprint hep-ph/9603331 (1996), to be published in Z.Phys. CGoogle Scholar
  14. 13.
    P.D.Acton et al. (OPAL collab.): Phys.Lett.B281, 405 (1992);ADSCrossRefGoogle Scholar
  15. 13a.
    R.Akers et al. (OPAL collab.): Z.Phys.C66, 31 (1995);ADSGoogle Scholar
  16. 13b.
    K. Ackerstaff et al. (OPAL collab.): “Search for CP Violation inZ 0 → τ+τ− and an Upper Limit on the Weak Dipole Moment of the τ Lepton”, preprint CERN-PPE/96-184 (1996)Google Scholar
  17. 14.
    D.Busculic et al. (ALEPH collab.): Phys.Lett.B297, 459 (1992);ADSCrossRefGoogle Scholar
  18. 14a.
    et al. Phys.Lett.B346, 371 (1995)ADSCrossRefGoogle Scholar
  19. 15.
    A.Stahl: Nucl.Phys. B (Proc. Suppl.)40, 505 (1995)ADSCrossRefGoogle Scholar
  20. 16.
    D. Busculic et al (ALEPH collab.): Phys.Lett.B384, 365 (1996)ADSCrossRefGoogle Scholar
  21. 17.
    A.Venturi, in Proc. of the XXVII Int. Conf. on High Energy Physics (eds. P.J. Bussey, I.G. Knowles), Bristol (1995), p.771Google Scholar
  22. 18.
    W.Bernreuther, A.Brandenburg, P.Overmann, Phys.Lett.B391, 413 (1997)ADSCrossRefGoogle Scholar
  23. 19.
    The LEP Electroweak Working Group and the SLD Heavy Flavor Group: A Combination of Preliminary LEP and SLD Electroweak Measurements and Constraints on the Standard Model”, Internal Note LEPEWWG/96-02 (1996)Google Scholar
  24. 20.
    Particle Data Group: Phys. Rev.D54 (1996)Google Scholar
  25. 21.
    N. Wermes: “CP Tests and Dipole Moments in τ-Pair Production Experiments”, Contribution to the International Workshop on Tau Lepton Physics (TAU96), Estes Park (1996); Univ. Bonn report BONN HE-90-10, ISSN-0172-8733Google Scholar
  26. 22.
    J.A.Grifols, A.Méndez: Phys.Lett.B255, 611 (1991)ADSCrossRefGoogle Scholar
  27. 23.
    B.Ananthanarayan, S.Rindani: Phys.Rev.D52, 2684 (1995);ADSGoogle Scholar
  28. 23a.
    P.Poulose, S.Rindani: Phys.Rev.D54, 4326 (1996)ADSGoogle Scholar
  29. 24.
    D.Atwood, A.Soni, Phys.Rev.D45, 2405 (1992)ADSGoogle Scholar
  30. 25.
    M.Davier, L.Duflot F.Le Diberder, A.Rougé: Phys.Lett.B306, 411 (1993)ADSCrossRefGoogle Scholar
  31. 26.
    M.Diehl, O.Nachtmann: Z.Phys.C62, 397 (1994)ADSGoogle Scholar
  32. 27.
    M.Diehl, O.Nachtmann: “Anomalous three gauge boson couplings ine + e − →W + W − and “optimal” strategies for their measurement”, eprint hep-ph/9702208, to appear in Eur. J. Phys. CGoogle Scholar
  33. 28.
    P.Overmann: “M - Reference Manual” (in preparation)Google Scholar

Copyright information

© Springer-Verlag 1998

Authors and Affiliations

  • D. Bruß
    • 1
  • O. Nachtmann
    • 2
  • P. Overmann
    • 2
  1. 1.Physics DepartmentUniversity of Oxford, Clarendon LaboratoryOxfordUK
  2. 2.Institut für Theoretische PhysikUniversität HeidelbergHeidelbergGermany

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