Results and prospects for $K\to\pi\nu\bar{\nu}$ at NA62 and KOTO

TL;DR

This paper reviews the current status and future prospects of measuring the ultra-rare $K o\pi uar{ u}$ decays at NA62 and KOTO, which are crucial for testing the Standard Model and exploring new physics.

Contribution

It provides an update on experimental results and future plans for $K o\pi uar{ u}$ decay measurements at NA62 and KOTO, highlighting their potential to probe physics beyond the Standard Model.

Findings

NA62 achieved SM sensitivity in 2016 for the charged channel

Preliminary results for the charged channel are presented

KOTO aims to reach SM sensitivity before measuring ~100 signal events

Abstract

The $K\to\pi\nu\bar{\nu}$ ultra-rare decays are precisely computed in the Standard Model (SM) and are ideal probes for physics beyond the SM. The NA62 experiment at the CERN SPS is designed to measure the charged channel with a precision of 10\%. The statistics collected in 2016 allows to reach the SM sensitivity. The KOTO experiment at J-PARC aims at reaching the SM sensitivity before performing a measurement with $\sim100$ signal events. The NA62 preliminary result for the charged channel is presented, together with the current experimental status of the neutral channel and their prospects for the coming years.