Chiral-invariant CP-violating Effective Interactions in Z Decays to three Jets

Abstract

Tests of CP violation by appropriate momentum correlations in $Z\to 3$ jets and in particular in $Z\to b\bar{b}X$ probe CP-violating effective couplings -- that manifest themselves as form factors -- which conserve the quark chirality and quark flavour. By giving two examples we show that such couplings can be induced at one-loop order in extensions of the Standard Model with CP violation beyond the Kobayashi-Maskawa phase. In one of the models we compute the chirality-conserving part of the CP-violating $Zb\bar{b}$-gluon amplitude for massless $b$ quarks, determine the resulting effective dimension $d=6$ couplings in the local limit, and discuss the possible size of the effects. Finally we show that in models with excited quarks the chiral-invariant CP-violating effective interactions could be quite large if appropriate couplings are of a size characteristic of a strong interaction

14 pages, LaTeX with 4 postscript figures, epsf macro included

References in corpus (1)

• CP Violation and the Width $Z\to b\bar{b}$

Cited by in corpus (5)

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• CP Violation in the 3 Jet and 4 Jet Decays of the Z Boson at GigaZ
• CP violation