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arXiv · hep-ph/0006120

Additional Isospin-Breaking Effects in epsilon'/epsilon

S. Gardner
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Abstract

Isospin-breaking effects, in particular those associated with electroweak-penguin contributions and pi0-eta,eta' mixing, have long been known to affect the Standard Model prediction of Re(epsilon'/epsilon) in a significant manner. We have found an heretofore unconsidered isospin-violating effect of importance; namely, the u-d quark mass difference can spawn |Delta I|=3/2 components in the matrix elements of the gluonic penguin operators. Using chiral perturbation theory and the factorization approximation for the hadronic matrix elements, we find within a specific model for the low-energy constants that we can readily accommodate an increase in Re(epsilon'/epsilon) by a factor of two.

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S. Gardner. 2000-06-12. Additional Isospin-Breaking Effects in epsilon'/epsilon. https://doi.org/10.1063/1.1330899

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