Some Remarks on the Search for CP Violation in Z-Decays
W. Bernreuther, O. Nachtmann
Abstract
We discuss some issues arising in the search for CP violation in the decays Z -> tau+ tau- and Z -> b b X. The form-factor and the effective Lagrangian approach to parametrize CP-violating effects are compared. We emphasize the interest to study both real and imaginary parts of CP-violating form factors like the weak dipole moment form factor dtauZ(m2Z) of the tau-lepton. We propose an 'optimal' way to search for CP violation when Z -> b b X events have to be selected on a statistical basis from the total number of Z hadronic decays.
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