Abstract
I review rare kaon decays. I introduce the flavor problem and possible solutions. Very rare kaon decays like K → πvv¯ are very important to this purpose: we study also K → πl+l-, K → ππee where chiral dynamics is important to disentangle short distance effects. We discuss also the decays K0 → μ+μ-, which have received recently some attention due to the measurement by LHCB.
Highlights
Introduction andK → πννRare kaon decays furnish challenging MFV probes and will severely constrain additional flavor physics motivated by new physics contributions (NP) [1]
We show that it is possible to find a range of parameters for bulk masses satisfying experimental flavor constraints, and we explain the neutral B-anomalies, requiring NP flavor scale at O(1) TeV
We have shown that in some appealing susy scenario in Fig. (3) [8] large allowed new physics contributions (NP) can be substantially larger that SM short distance (SD) contributions
Summary
Introduction andK → πννRare kaon decays furnish challenging MFV probes and will severely constrain additional flavor physics motivated by NP [1]. Typical BSM predict new flavor structures that might affect K → πννthat can be tested at NA62 and KOTO [2]; we describe two different BSM effects i) new flavor structures for avoiding ∆S = 2 constraints (Fig. 1) [1, 3] and ii) attempts to describe B-anomalies [4], typically induce large flavor effects at O(1) TeV [5].
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