$K \rightarrow \pi \ell^+ \ell^-$: Status and update

TL;DR

This paper reviews the current theoretical understanding of the rare kaon decays $K ightarrow \pi \ell^+ ext{ extellipsis} ext{ extellipsis}$, highlighting their significance for future experimental studies at facilities like NA62 and K0TO.

Contribution

It provides an updated overview of the theoretical status of $K ightarrow \pi \ell^+ ext{ extellipsis} ext{ extellipsis}$ decays in anticipation of upcoming experimental measurements.

Findings

Summarizes the theoretical predictions for $K ightarrow \pi \\ell^+ ext{ extellipsis} ext{ extellipsis}$ decays.

Highlights the importance of these decays for testing the Standard Model and searching for new physics.

Discusses the prospects for future experimental measurements at NA62 and K0TO.

Abstract

$K \rightarrow \pi \ell^+ \ell^-$ decays, $\ell = e, \mu$, will be one of the goals of future kaon facilities, like NA62 (CERN) and K$^0$TO (J-PARC). We review briefly the theoretical status of those processes.