MO-A9-3 10:45

A Search For The Decays B+ To Ell Nu (ell=e,nu) Using Hadronic Tag Reconstruction, Miika Klemetti , S.H. Robertson , McGill University — We present a search for the rare decay modes [B⁺ ® m⁺n_m], and [B⁺ ® e⁺n_e] with data collected by the BaBar detector at the PEP-II storage ring at SLAC in Stanford, California. This search utilizes a novel technique in which we fully reconstruct the accompanying B‾ in ¡ (4S) events, and look for a monoenergetic lepton in the B⁺ frame. We present the preliminary results of the analysis, which is based on a data sample of approximately 230 million B⁺B‾ pairs (corresponding to an integrated luminosity of ~ 207fb^-1).