Rare K Decays: Present and perspectives with NA62

TL;DR

This paper reviews the current status and future perspectives of rare K meson decay studies with the NA62 experiment, highlighting tests of the Standard Model and searches for new physics through precise measurements.

Contribution

It presents recent results on lepton universality and rare decay studies, and details the NA62 detector setup and analysis methods for measuring rare kaon decays.

Findings

Measurement of the lepton universality ratio R_K.

Status update on K+- to pi+- gamma gamma and K+ to e+ nu gamma decays.

Preparation for measuring Br(K+ to pi+ nu anti-nu) with 10% precision.

Abstract

Rare kaon decays provide unique opportunity to test the Standard Model and probe its possible extensions. The final result on the lepton universality test by measuring the ratio R_K = G(K+- to e+- nu)/G(K+- to mu+- nu) is presented as well as the status of the study of the rare decays K+- to pi+- gamma gamma and K+ to e+ nu gamma. The primary goal of the NA62 experiment is the measurement of the Br(K+ to pi+ nu anti-nu) decay with a precision of 10% in two years of data taking. The detector setup together with the analysis technique is described.