CP violation andZ boson decays |
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Authors: | W. Bernreuther U. Löw J. P. Ma O. Nachtmann |
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Affiliation: | 1. Institut für Theoretische Physik der Universit?t Heidelberg, Philosophenweg 16, D-6900, Heidelberg, Federal Republic of Germany
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Abstract: | We present a general discussion ofCP-violating effects in the following two and three body decays of theZ boson:Z→l + l ?,Z→l + l ?γ, wherel=e, μ, τ andZ→2 jets,Z→ 2 jets+γ, andZ→ 3 jets. Experimental observables sensitive toCP violation in these decays are discussed systematically for the case that polarizations of final state particles are not observed. It is shown that the standard model predicts only extremely smallCP-violating effects for the above decays. PossibleCP-violating interactions beyond the standard model are parametrized in terms of aCP-odd effective Lagrangian containing coupling constants proportional to Λ P -1 and Λ P -2 . Here Λ CP is the mass scale associated with the assumed new interactions. We give estimates of the bounds obtainable for Λ CP in experiments at LEP1. |
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