CP violation in the 3 jet and 4 jet decays of the Z boson at GigaZO. Nachtmann1 and C. Schwanenberger2
1 Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany
2 Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22603 Hamburg, Germany
(Received: 21 August 2003 / / Published online: 20 November 2003)
We review CP-violating effects in jet and 4 jet decays, assuming the presence of CP-violating effective and couplings. Longitudinal beam polarization is included in the studies. We propose a direct search for such CP-violating couplings by using various CP-odd observables. The data of a future linear collider running at the Z-resonance in the so-called GigaZ option should give significant information on the couplings. Finally we show that stringent bounds on the mass of excited b quarks can be derived if appropriate couplings are of a size characteristic of a strong interaction.
© Società Italiana di Fisica, Springer-Verlag 2004