Status of measurement of KS -> pi e nu branching ratio and lepton charge asymmetry with the KLOE detector

TL;DR

This paper reports on the analysis of a large dataset from the KLOE detector to measure the KS -> pi e nu branching ratio and lepton charge asymmetry, aiming to improve precision and test fundamental symmetries.

Contribution

It provides an updated measurement of KS decay properties with increased statistical sample, enhancing tests of CPT symmetry and the Delta S = Delta Q rule.

Findings

Improved measurement precision of KS -> pi e nu branching ratio.

Enhanced constraints on CPT symmetry and Delta S = Delta Q rule.

Analysis based on 1.7 billion KSKL events from DAFNE.

Abstract

We present the current status of the analysis of about 1.7 billion KSKL pair events collected at DAFNE with the KLOE detector to determine the branching ratio of KS -> pi e nu decay and the lepton charge asymmetry. This sample is ~4 times larger in statistics than the one used in a previous KLOE analysis, allowing us to improve the accuracy of the measurement and of the related tests of CPT symmetry and Delta S = Delta Q rule.