Vus and lepton universality from kaon decays with the KLOE detector

TL;DR

This paper reports comprehensive measurements of kaon decay properties by KLOE, providing crucial data for testing lepton universality, CKM matrix unitarity, and probing new physics beyond the Standard Model.

Contribution

It offers a detailed compilation of kaon decay measurements and their implications for fundamental physics tests, including lepton universality and CKM matrix unitarity.

Findings

Precise determination of Vus from kaon decays.

Tests of lepton universality with current data.

Constraints on new physics from decay measurements.

Abstract

KLOE has measured most decay branching ratios of Ks, Kl and K+/- mesons. It has also measured the Kl and the K+- lifetime and determined the shape of the form factors involved in kaon semileptonic decays. We present in the following a description of the above measurements and a well organized compendium of all of our data, with particular attention to correlations. These data provide the basis for the determination of the CKM parameter Vus and a test of the unitarity of the quark flavor mixing matrix. We also test lepton universality and place bounds on new physics using measurements of Vus from Kl2 and Kl3 decays.