Long-distance effects in rare and radiative K decays

TL;DR

This paper reviews the electroweak structures of rare and radiative K decays, emphasizing their roles in probing new physics and controlling hadronic uncertainties through phenomenological strategies.

Contribution

It provides a systematic review of the phenomenological methods used to predict rare K decay rates within the Standard Model.

Findings

Rare decays are sensitive to short-distance physics and new physics.

Radiative decays are dominated by long-distance physics but help control uncertainties.

Current strategies effectively predict decay rates with manageable uncertainties.

Abstract

The electroweak structures of the FCNC-induced rare and radiative K decays are presented. While the former decays are sensitive to short-distance physics and offer exceptional probes for new physics, the latter are dominated by long-distance physics. Even so, they should not be set aside since they constitute essential ingredients to control the hadronic uncertainties occurring for the rare decays. This is illustrated by systematically reviewing the phenomenological strategies currently in use to cleanly predict the rare K decay rates in the Standard Model.