TL;DR
This paper reviews recent experimental and theoretical advances in kaon decays that enable stringent tests of the Standard Model, including CKM matrix evaluations and universality tests.
Contribution
It provides an updated evaluation of Vus and discusses tests of CKM unitarity, gauge universality, and lepton universality using kaon decay data.
Findings
Updated Vus value from kaon decays
Consistent CKM unitarity within experimental uncertainties
No significant deviation from Standard Model predictions
Abstract
During the last few years, new experimental and theoretical results have allowed ever more stringent tests of the Standard Model to be performed using kaon decays. This overview of recent progress includes an updated evaluation of the CKM matrix element Vus. Tests of CKM unitarity and gauge universality and lepton universality tests with Kl2 and Kl3 decays are discussed.
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