Study of the Absolute Branching Fraction of Upsilon(4S) to anti-B⁰ B⁰ with Partial Reconstruction of anti-B⁰ to D^(*+) lepton^- anti-nu_(lepton) at BABAR

Based on a data sample of 81.7 fb^-1 collected at the Upsilon(4S) resonance with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, we present the current status of the measurement of the branching fraction of Upsilon(4S) to B0bar B^0. Our study of the decay was performed through the exclusive decays B0bar to D^{*+} \ell^{-} bar{\nu}_{\ell} using a partial reconstruction method, where the D^{*+} is detected only through the soft pion daughter from the decay D^{*+} to D^{0} pi^{+}.