Speaker
Description
The NA62 Experiment, installed in the CERN North Area, studies the physics of the $K^+$ meson.
Its main purpose is to measure the branching ratio of the ultra-rare decay $K^+\rightarrow\pi^+\nu\bar\nu$ with a $10\%$ precision, in order to strictly test the Standard Model, that gives for that physics quantity a very precise prediction: $BR(K^+\rightarrow\pi^+\nu\bar\nu) = (0.84 \pm 0.10) \times 10^{-10}$.
After the full detector installation, completed in 2016, NA62 collected data in the years 2016, 2017 and 2018.
On the 2016 data sample, that corresponds to $2\%$ of the total NA62 statistics in the period 2016-2018, one signal candidate has been observed, leading to the upper limit: $BR(K^+\rightarrow\pi^+\nu\bar\nu) < 14 \times 10^{-10}$ @ $95\%$ C.L.
The analysis of the 2017 data sample (10 times the 2016 statistics) is ongoing, and preliminary results, together with future perspectives, will be presented.
The NA62 physics program also covers the searches for exotic and forbidden Kaon decays: the most recent results on searches for lepton number violating $K^+$ decays ($K^+\rightarrow\pi^- e^+ e^+$ and $K^+\rightarrow\pi^- \mu^+ \mu^+$) and for production of an invisible dark photon in $\pi^0$ decays ($K^+\rightarrow\pi^+ \pi^0, \pi^0 \rightarrow A' \gamma$) will be shown.
