Search for the decay $B^+ \to K^+ \nu \bar \nu$

We present a search for the decay $B^+ \to K^+ \nu \bar \nu$ performed with data collected by the BaBar detector at the PEP-II asymmetric energy storage rings. The analysis is carried out in the recoil of a reconstructed $B$ using semileptonic tags (the tagged $B$ decays in a $D^{(*)0} \ell^+ \nu$ channel). We performed this study using both a cut-and-count method (BumpHunter tool in StatPatternRecognition), and multivariate approach (Random Forest tool included in StatPatternRecognition). A comparison of these studies is given.