Semileptonic Kaon Decays in Chiral Perturbation Theory

TL;DR

This paper calculates matrix elements for various semileptonic kaon decays using next-to-leading order chiral perturbation theory and compares predictions with experimental data, aiding understanding of low-energy Standard Model physics.

Contribution

It provides detailed theoretical predictions for semileptonic kaon decays at NLO in chiral perturbation theory, including Monte Carlo simulations for experimental comparison.

Findings

Predictions agree with existing experimental data

Monte Carlo generators accurately simulate decay rates

Insights into low-energy Standard Model structure

Abstract

We present the matrix elements for the semileptonic kaon decays $K_{l2\gamma}$, $K_{l2l^+l^-}$, $K_{l2l'^+l'^-}$, $K_{l3}$, $K_{l3\gamma}$ and $K_{l4}$ at next-to-leading order in chiral perturbation theory and compare the predictions with experimental data. Monte Carlo event generators are used to calculate the corresponding rates at DAFNE. We discuss the possibilities to improve our knowledge of the low-energy structure of the Standard Model at this and similar machines.