Recent NA48 results on semileptonic and rare kaon decays. Measurement of Vus

TL;DR

This paper reports recent NA48 measurements of semileptonic and rare kaon decays, including branching fractions, form-factors, and radiative decay ratios, to determine the CKM matrix element Vus and update kaon decay data.

Contribution

It provides new experimental results on kaon decay parameters and Vus extraction, enhancing the precision of kaon decay measurements and rare decay data.

Findings

Measured branching fractions of K^0_Le3 and K^{ u}e3 decays

Determined Vus from kaon decay data

Reported Ke3 form-factors and radiative decay ratios

Abstract

The new results of investigation of K^0_Le3 and K^{\pm}e3 decays performed by NA48 Collaboration are presented. The measured branching fractions are used to extract Vus. The values of Ke3 form-factors and radiative K^0_Le3\gamma branching ratio are reported. A list of recent NA48 results concerning some rare neutral kaon decays is given.