Kaon Flavour Physics Strikes Back

Abstract

In this short presentation I emphasize the increased importance of kaon flavour physics in the search for new physics (NP) that we should witness in the rest of this decade and in the next decade. The main actors will be the branching ratios for the rare decays K + → π + νν and KL → π 0 νν, to be measured by NA62 and KOTO, and their correlations with the ratio ε /ε on which recently progress by lattice QCD and large N dual QCD approach has been made implying a new flavour anomaly. Further correlations of K + → π + νν, KL → π 0 νν and ε /ε with εK , ∆MK , KL → µ + µ − and KL → π 0 + − will help us to identify indirectly possible NP at short distance scales. This talk summarizes the present highlights of this facinating field including some results from concrete NP scenarios. To be published online by the Institute of Physics Proceedings.

The Return of Kaon Flavour Physics

“…A number of authors investigated what kind of NP could give sufficient upward shift in ε /ε and what would then be implications for K + → π + νν and K L → π 0 νν. The summary of these studies can be found in the reviews in [5][6][7] so that I will make only general comments on them. The up-to-date list of relevant papers is collected in Table 1.…”

“…Therefore I changed my strategy and concentrated since 2014 [2], with few exceptions, on Kaon flavour physics. A series of reviews on our work appeared in [3][4][5][6][7].…”

Hadronic resonances with exotic electric charge

“…with lepton number L = 2 [5,6] 7. It has a neutral Z vector boson which contributes to flavor physics [9], 8. The model has candidates for dark matter [10], 9.…”