Study of the Absolute Branching Fraction of Upsilon(4S) to anti-B^0 B^0 with Partial Reconstruction of anti-B^0 to D^{*+} lepton^- anti-nu_{lepton} at BABAR

TL;DR

This paper reports a measurement of the Upsilon(4S) decay branching fraction to B0bar B^0 using partial reconstruction of B0bar decays involving D^{*+} and leptons, based on data from the BABAR experiment.

Contribution

It introduces a partial reconstruction technique to measure the Upsilon(4S) to B0bar B^0 branching fraction with improved efficiency.

Findings

Measured the branching fraction of Upsilon(4S) to B0bar B^0.

Used partial reconstruction of B0bar to D^{*+} lepton^- anti-nu_{lepton} decays.

Analyzed 81.7 fb^-1 of data collected at BABAR.

Abstract

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^{+}.