Kaon physics with KLOE

TL;DR

This paper discusses kaon physics experiments with KLOE to test the Standard Model and search for new physics through precise measurements of kaon decays and CKM matrix unitarity.

Contribution

It presents new measurements of kaon decay widths and the ratio RK, providing tests of the Standard Model and constraints on new physics.

Findings

Unitarity of the CKM matrix's first row confirmed within experimental uncertainties.

Measured RK ratio with high precision, consistent with Standard Model predictions.

Constraints on lepton-flavor violation effects from kaon decay data.

Abstract

Kaon physics can test new-physics effects in leptonic or semileptonic decays. A unitarity test of the first row of the CKM mixing matrix is obtained from the precision measurements of Kl3 widths for K{\pm}, KL, and (unique to KLOE) KS. The KLOE measurement of RK = {\Gamma}(Ke2)/{\Gamma}(K{\mu}2) with an accuracy at the % level, aims at finding evidence of deviations from the SM prediction induced by lepton-flavor violation new-physics effects.