# Rare strange particle decays

## TL;DR

This paper reviews the significance of rare kaon decays, specifically $ ext{K}^+ o ext{pi}^+
u ar{
u}$ and $ ext{K}_L o ext{pi}^0
u ar{
u}$, highlighting experimental efforts at NA62 and KOTO, and discussing recent results and future prospects.

## Contribution

It provides an overview of recent experimental measurements of rare kaon decays and discusses the potential for future discoveries in flavor physics.

## Key findings

- Latest results from NA62 and KOTO experiments.
- Experimental measurements are approaching theoretical precision.
- Future experiments will further explore rare kaon decay modes.

## Abstract

The rare decays $\mathrm{K}^+\to \pi^+ \nu \bar{\nu}$ and $\mathrm{K_L}\to \pi^0 \nu \bar{\nu}$ are extremely attractive processes to study flavor physics because they are both exceptionally clean from a theoretical point of view. These modes are measured by the experiments NA62 at CERN in Switzerland and KOTO at J-PARC in Japan, respectively. The latest results from these experiments together with future prospects are presented. The NA62 experiment has, besides the main goal, a rich physics program on other rare kaon decays which will be also discussed.