The return of kaon flavour physics

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Abstract

Kaon flavour physics has played in the 1960s and 1970s a very important role in the construction of the Standard Model (SM) and in the 1980s and 1990s in SM tests with the help of CP violation in KL → ππ decays represented by εK and the ratio ε/ε. In this millennium, this role has been taken over by Bs,d and D mesons. However, there is no doubt that in the coming years, we will witness the return of kaon flavour physics with the highlights being the measurements of the theoretically clean branching ratios for the rare decays K+ → π+νν¯ and KL → π0νν¯, and the improved SM predictions for the ratio ε/ε, for εK and the K0–K¯ 0 mixing mass di erence ∆MK. Theoretical progress on the decays KL,S → µ+µ and KL → π0+− is also expected. They are all very sensitive to new physics (NP) contributions and the correlations between them should help us to identify new dynamics at very short distance scales. These studies will be enriched when theory on the K → ππ isospin amplitudes ReA0 and ReA2 improves. This paper summarizes several aspects of this exciting field. In particular, we emphasize the role of the Dual QCD approach in getting the insight in the numerical Lattice QCD results on K0–K¯ 0 mixing and K → ππ decays.

Original languageEnglish
Pages (from-to)1043-1078
Number of pages36
JournalActa Physica Polonica B
Volume49
Issue number6
DOIs
StatePublished - Jun 2018

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