Measurements of the Absolute Branching Ratios for the Dominant KL Decays, the KL Lifetime, and Vus with the KLOE Detector

TL;DR

This paper reports precise measurements of the dominant KL decay branching ratios, the KL lifetime, and the Vus parameter using a large sample of Phi mesons at DAFNE, with implications for testing the Standard Model.

Contribution

It provides the first fully inclusive measurements of KL branching ratios and lifetime, improving the precision of Vus determination from semileptonic decays.

Findings

Accurate measurements of KL branching ratios and lifetime.

Determination of Vus with reduced systematic uncertainties.

Results consistent with Standard Model predictions.

Abstract

From a sample of about 10^9 Phi mesons produced at DAFNE, we have selected KL mesons tagged by observing KS->pi+pi- decays. We present results on the major KL branching ratios, including those of the semileptonic decays needed for the determination of Vus. These branching ratio measurements are fully inclusive with respect to final-state radiation. The KL lifetime has also been measured.