NNLO contributions to epsilon_K and rare kaon decays

TL;DR

This paper reviews advanced theoretical calculations, including NNLO QCD and electroweak corrections, for predicting epsilon_K and rare kaon decays within the Standard Model, enhancing precision in flavor physics.

Contribution

It provides a detailed review of higher-order QCD and electroweak contributions to epsilon_K and rare kaon decays, including recent NNLO calculations.

Findings

NNLO QCD calculations improve theoretical precision

Electroweak corrections significantly affect decay predictions

Updated theoretical framework for flavor-changing processes in the Standard Model

Abstract

We discuss the theory prediction of epsilon_K and the rare K -> pi nu nu-bar decays and review the structure and current status of higher-order contributions to these flavour changing processes in the standard model in some detail. This includes the next-to-next-to-leading order QCD calculation to the charm quark contribution to K+ -> pi+ nu nu-bar and to the charm-top quark contribution to epsilon_K. Electroweak corrections to the rare kaon decays are also discussed.