Leptonic B decays at BaBar
  We will present the most recent results on leptonic B decays   $B^{\pm(0)} \to K^{* \pm (0)} \nu \bar{\nu}$ and   $B^{\pm} \to \mu^{\pm} \nu$, based on the data collected by the BaBar detector at PEP-II, an asymmetric $e^+ e^-$ collider at the center of mass energy of the $\Upsilon(4S)$ resonance . 
Elisabetta Baracchini (the BaBar Collaboration)