# Latest results from the NA62 experiment at CERN

## TL;DR

The NA62 experiment at CERN has analyzed data from 2016-2018 to measure the rare decay $K^+\to\pi^+\nu\bar{\nu}$ with high precision, also exploring other rare decays and new physics scenarios.

## Contribution

This paper presents the latest results from NA62, including the first measurement of the $K^+\to\pi^+\nu\bar{\nu}$ decay and new limits on dark photons and lepton number violation.

## Key findings

- First measurement of $K^+\to\pi^+\nu\bar{\nu}$ decay with 10% precision.
- New limits set on dark photon existence.
- Search results for lepton number violating decays.

## Abstract

NA62 is a fixed target kaon experiment at the CERN SPS which aims at measuring the branching ratio of the $K^+\to\pi^+\nu\bar{\nu}$ decay with 10% precision. This ultra-rare kaon decay is theoretically extremely clean and an ideal place to look for physics beyond the Standard Model. The NA62 experiment has been running in 2016-2018 and has accumulated a large amount of kaon decays. The final result of the $K^+\to\pi^+\nu\bar{\nu}$ analysis using the 2016 dataset is discussed as well as prospects for the analysis of the 2017 dataset. NA62 also has sensitivity to various other rare and forbidden kaon decays, as well as some hidden sector models. The results of a search for the Lepton Number Violating decays $K^+\to\pi^-\ell^+\ell^+\ [\ell=e,\mu]$ is presented, along with new limits on the existence of a dark photon.