Status of the measurement of K S -> {\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 of K_S K_L pairs to measure the branching ratio of K_S -> πeν decay and lepton charge asymmetry, aiming to improve precision and test fundamental symmetries.

Contribution

The study provides an improved measurement of the K_S -> πeν branching ratio and lepton charge asymmetry using a significantly larger dataset at KLOE, enhancing tests of CPT symmetry and the ΔS = ΔQ rule.

Findings

Increased statistical precision over previous measurements.

Enhanced tests of CPT symmetry and ΔS = ΔQ rule.

Updated values for branching ratio and asymmetry.

Abstract

We present the current status of the analysis of about 1.7 billion K_S K_L pair events collected at DA{\Phi}NE with the KLOE detector to determine the branching ratio of K_S -> {\pi}e{\nu} decay and the lepton charge asymmetry. This sample is ~4 times larger in statistics than the one used in the previous most precise result, from KLOE as well, allowing us to improve the accuracy on the measurement and related tests of CPT symmetry and Delta S = Delta Q rule.