  The main physics goal of the NA62 experiment at CERN is to precisely measure
the branching ratio of the kaon rare decay $K^+\rightarrow \pi^+ \nu \bar\nu$.
This decay is strongly suppressed in the Standard Model and its branching ratio
is theoretically calculated with high accuracy. The NA62 experiment is designed
to measure this decay rate with an uncertainty better than 10\%. The
measurement can be a good probe of new physics phenomena, which can alter the
SM decay rate. The NA62 experiment has been successfully launched in October
2014. In this document, after an introduction to the theoretical framework, the
NA62 experimental setup is described and a first look at the pilot run data is
reported.
