DOI: 10.1140/epjc/s2003-01369-y
CP violation in the 3 jet and 4 jet decays of the Z boson at GigaZ
O. Nachtmann1 and C. Schwanenberger21 Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany
2 Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22603 Hamburg, Germany
O.Nachtmann@thphys.uni-heidelberg.de
schwanen@mail.desy.de
(Received: 21 August 2003 / / Published online: 20 November 2003)
Abstract
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
