Vus determination from kaon decays

TL;DR

This paper reviews and combines recent experimental data on kaon decays to precisely determine the CKM matrix element Vus and test the Standard Model's predictions using leptonic and semileptonic decay analyses.

Contribution

It provides a comprehensive analysis of recent kaon decay data, offering an accurate determination of Vus and testing the Standard Model with updated experimental and theoretical constraints.

Findings

Precise Vus value obtained from combined data

Validation of Standard Model predictions through decay tests

Critical review of experimental results from multiple collaborations

Abstract

This review presents the analysis of leptonic and semileptonic kaon decays data done by the FlaviaNet Kaon Working group, as described in FlaviaNet Note of October 2008. Data include all recent results by BNL-E865, KLOE, KTeV, ISTRA+, and NA48. Experimental results are critically reviewed and combined, taking into account theoretical (both analytical and numerical) constraints on the semileptonic kaon form factors. We report on a very accurate determination of Vus as well as on many other tests of the SM which can be performed with leptonic and semileptonic kaon decays.