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We review CP-violating effects in \(Z \rightarrow 3\) jet and \(Z \rightarrow\) 4 jet decays, assuming the presence of CP-violating effective \(Z b \bar{b} G\) and \(Z b \bar{b} G G\) 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.

CP violation in the 3 jet and 4 jet decays of the Z boson at GigaZ