$K^+ \ra \pi^+ \pi^0 \gamma$ in the Standard Model and Beyond
  In this note we show how improved theoretical analysis combined with recent experimental data coming from NA48/2 concerning $K^+ \to \pi^+ \pi^0 \gamma$ decay shed light on the dynamics of the $s \rightarrow d \gamma$ transition. Consequences on NP analysis are also presented. 
Philippe Mertens
hep-ph