Rare meson decays are among the most sensitive probes of both heavy and light new
physics. Among them, new physics searches using kaons benefit from their small total decay …

Kaon physics is at a turning point–while the rare-kaon experiments NA62 and KOTO are in
full swing, the end of their lifetime is approaching and the future experimental landscape …

We reemphasize the strong dependence of the branching ratios $ B (K^+\to\pi^+\nu\bar\nu)
$ and $ B (K_L\to\pi^ 0\nu\bar\nu) $ on $| V_ {cb}| $ that is stronger than in rare $ B …

A bstract The kaon sector is characterised by several processes which are under active
investigation across different experiments. In this work, we present the global picture that …

A bstract We present a comprehensive calculation of the KL→ γ∗ γ∗ form factor in
dispersion theory, using input from the leptonic decays KL→ ℓ+ ℓ− γ,\({K} _ {L}\to {{\ell}} …

A timely and long-term programme of kaon decay measurements at a new level of precision
is presented, leveraging the capabilities of the CERN Super Proton Synchrotron (SPS). The …

We propose an economical model to address the mass hierarchies of quarks and charged
leptons. The light generations of the left-handed fermions form doublets under an\(\textrm …

We find that the phase appearing in the unitarity relation between B (KL→ µ+ µ−) and B
(KL→ γγ) is equal to the phase shift in the interference term of the timedependent K→ µ+ µ …

A bstract The decay KS→(μ+ μ−) ℓ= 0, with the final muon pair in an angular-momentum
zero state, is a sensitive probe of short-distance physics. It has recently been shown how to …

A bstract Rare kaon decays offer a powerful tool for investigating new physics in s→ d
transitions. Currently, many of the interesting decay modes are either measured with rather …