This review contains an overview of strong interaction effects in weak decays starting with a historical introduction. It contains a short overview of semileptonic decays and their relevance for measuring CKM matrix elements. The main part is devoted to the theoretical calculation on nonleptonic matrix elements relevant for K<sup>0</sup>-K<sup>0</sup>bar mixing and K to pi pi decays. It concludes with a short summary of rare kaon decays.
| Original language | English |
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| Title of host publication | at the frontier of Particle Physics: handbook of QCD |
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| Editors | M Shifman |
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| Publisher | World Scientific Publishing |
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| Pages | 2155-2214 |
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| Volume | 4 |
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| ISBN (Print) | 981-238-028-0 |
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| Publication status | Published - 2002 |
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