Measurement of the Branching Fraction of $\bar{B}^0 \to D^{*+}\ell^- \bar \nu$ by Partial Reconstruction

We present the branching fraction measurement of $\bar{B}^0 \to D^{*+}\ell^- \bar \nu$ using data collected with the BaBar detector at the PEP-II $e^+e^-$ storage rings at the Stanford Linear Accelerator. We conduct the measurement by partially reconstructing the $D^{*+}$ mesons from $\bar{B}^0 \to D^{*+}\ell^- \bar \nu$ decays. We will discuss the methodology and provide preliminary estimates of the branching fraction of $\bar{B}^0 \to D^{*+}\ell^- \bar \nu$ using the partial reconstruction technique.