New measurement of the $K^+ \to \pi^+\nu \bar{\nu}$ decay by the NA62 Experiment

by Dr Joel Swallow (INFN - Laboratori Nazionali di Frascati)

Wednesday 20 Nov 2024, 13:30 → 14:30 Europe/London

Small Lecture Theatre (Poynting)

The  $K^+ \to \pi^+\nu \bar{\nu}$ decay is a golden mode for flavour physics. Its branching ratio is predicted with high precision by the Standard Model to be less than $10^{-10}$, and this decay mode is highly sensitive to indirect effects of new physics up to the highest mass scales. The NA62 experiment at the CERN SPS is designed to study the $K^+ \to \pi^+\nu \bar{\nu}$ decay, and provided the world's most precise investigation of this decay using 2016-18 data. Building on this success the first results from a significantly improved analysis of new data, taken in 2021-22 after brem-line and detector upgrades, are presented, as well as the combination with the 2016-18 results.