Measurement of the Branching Fractions of Exclusive anti-B -> D/D*/D(*) pi l- anti-nu_l Decays in Events Tagged by a Fully Reconstructed B Meson

TL;DR

This paper reports precise measurements of branching fractions for specific anti-B meson decays involving D, D*, pi, l, and anti-nu_l particles, using a large dataset and full B meson reconstruction.

Contribution

It provides the first detailed measurements of these exclusive decay modes with improved accuracy and systematic uncertainty control.

Findings

Measured branching fractions for multiple decay channels with statistical and systematic errors.

Results are consistent with theoretical predictions and previous measurements within uncertainties.

Provides a comprehensive dataset for testing B meson decay models.

Abstract

We present a measurement of the branching fractions for anti-B -> D/D*/D(*) pi l^- anti-nu_l decays based on 341.1 fb-1 of data collected at the Upsilon(4S) resonance with the BaBar detector at the pep-II e^+e^- storage rings. Events are tagged by fully reconstructing one of the B mesons in a hadronic decay mode. We obtain BF (B^- -> D^0 l^- anti-nu_l) = (2.33 +/- 0.09(stat.) +/- 0.09(syst.))%, BF (B^- -> D^*0 l^- anti-nu_l) = (5.83 +/- 0.15(stat.) +/- 0.30(syst.))%, BF (B0bar -> D^+ l^- anti-nu_l) = (2.21 +/- 0.11(stat.) +/- 0.12(syst.))%, BF (B0bar -> D^*+ l^- anti-nu_l) = (5.49 +/- 0.16(stat.) +/- 0.25(syst.))%, BF (B^- -> D^+ pi^- l^- anti-nu_l) = (0.42 +/- 0.06(stat.) +/- 0.03(syst.))%, BF (B^- -> D^*+ pi^- l^- anti-nu_l) = (0.59 +/- 0.05(stat.) +/- 0.04(syst.))%, BF (B0bar -> D^0 pi^+ l^- anti-nu_l) = (0.43 +/- 0.08(stat.) +/- 0.03(syst.))% and BF (B0bar -> D^*0 pi^+ l^- anti-nu_l) = (0.48 +/- 0.08(stat.) +/- 0.04(syst.))%.