NA48/62 latest results

The NA62 experiment at the CERN SPS recorded in 2007 a large sample of $K^+ \to \mu^+ \nu_{\mu}$ decays. A peak search in the missing mass spectrum of this decay is performed. In the absence of observed signal, the limits obtained on $\mathscr{B}(K^+\to \mu^+ \nu_{h})$ and on the mixing matrix element $\mid U_{\mu 4}\mid$ are reported. The upgraded NA62 experiment started data taking in 2015. About $5 \times 10^{11}K^+$ decays have been recorded so far to measure the branching ratio of the $K^+ \to \pi^+ \nu\overline{\nu}$ decay. Preliminary results from the $K^+ \to \pi^+ \nu\overline{\nu}$ analysis based on about 5% of the 2016 statistics are reported