Il Nuovo Cimento A (1965-1970)

, Volume 107, Issue 9, pp 1459–1516 | Cite as

Violation ofCP invariance in K0 decays

  • E. H. Lemke


Weak vector bosons representing a compound of two Lorentz spinors may lead toCP-violating effects by a γ-W-W interaction term. Such a term is applied to the calculation of the contribution of a particular type of graphs to the admixture parameter of the neutral K-mesons. We analyse the box graphs whose W-bosons emit a photon to the opposite quark leg in the free-quark limit. Methods of precisely calculating such two-loop graphs are presented. Novel strong-interaction matrix elements appear. It is shown that there is aCP-violating contribution. It vanishes in the mathematical quark mass limitmsmd. We always assume that all the flavour mixing elements are real. Three main results are: 1) The experimentally observed phase arg (ε) of the admixture parameter can be reproduced exactly. 2) The top-quark contribution is negligible. 3) Although a logarithmical divergence appears in one of the two-loop integrals, which is regularized by the s-quark mass, the known quarks and weak bosons are not enough to reproduce the magnitude of ⋎ε⋎. This data value would definitely point to the existence of heavy-quark partners.

PACS 11.30.Er

Charge conjugation, parity, time reversal, and other discrete symmetries 

PACS 12.15.Ji

Applications of electroweak models to specific processes 

PACS 13.20.Eb

K decays 


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Copyright information

© Società Italiana di Fisica 1994

Authors and Affiliations

  • E. H. Lemke
    • 1
  1. 1.Physikalisches Institut Jöllenbecker HeideBielefeldGermany

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