Measurement of the $K^{+}\to {\pi }^{+}\gamma \gamma$ decay

The NA62 Collaboration

A sample of 3984 candidates of the $K^{+}\to {\pi }^{+}\gamma \gamma$ decay, with an estimated background of $291\pm 14$ events, was collected by the NA62 experiment at CERN during 2017-2018. In order t…