Speaker
Description
The NA62 experiment at the CERN SPS is designed to measure the branching ratio of the K+→π+vv ̅ decay, one of the best candidates to reveal indirect effects of new physics beyond the Standard Model (SM) at the highest mass scales in the flavour sector. The large data sample collected by NA62 in 2016-2018 provides sensitivities to rare kaon decays with branching ratios as low as 10-11. The high-intensity setup and the detector performance make NA62 particularly suited for searching new physics effects from different scenarios involving feebly interacting particles in the MeV—GeV mass range: heavy-neutral leptons, axion-like particles, and others.
The preliminary new result of the 𝐵𝑟(𝐾+→𝜋+𝜈𝜈¯) measurement, the most precise achieved so far, will be presented.
New results from an analysis of the flavour-changing neutral current decay K+→π+mu+mu-, well suited to explore the SM structure and, possibly, its extensions, and new results of searches for lepton flavour and lepton number violating decays of the charged kaon are also available.
Searches for heavy neutral lepton production in K+ → e+N and K+ → mu+N decays, which established upper limits on the elements of the extended neutrino mixing matrix |Ue4|2 and |Umu4|2 at the levels of 10-9 and 10-8, respectively, improving on the earlier searches in the kinematically accessible mass range, are reviewed.
Future prospects and plans for data taking from 2021 will be outlined.
