Dalitz Plot Analysis of B- -> D+ pi- pi-

TL;DR

This paper presents a detailed Dalitz plot analysis of B- decays to D+ pi- pi-, measuring branching fractions and properties of intermediate resonant states with high precision using a large data sample from the BaBar experiment.

Contribution

It provides the first precise measurements of the masses and widths of D*0 resonances and the branching fraction for B- -> D+ pi- pi- decays, using a comprehensive Dalitz plot analysis.

Findings

Branching fraction BR(B- -> D+ pi- pi-) = (1.08 +/- 0.03 +/- 0.05) x 10^-3

Mass of D*0_2 measured as (2460.4 +/- 1.2 +/- 1.2 +/- 1.9) MeV/c2

Width of D*0_0 measured as (273 +/- 12 +/- 17 +/-45) MeV

Abstract

We report on a Dalitz plot analysis of B- -> D+ pi- pi- decays, based on a sample of about 383 million Upsilon(4S) -> BBbar decays collected with the BaBar detector at the PEP-II asymmetric-energy B Factory at SLAC. We find the total branching fraction of the three-body decay: BR(B- -> D+ pi- pi-) = (1.08 +/- 0.03 +/- 0.05) x 10^-3. The masses and widths of D^{*0}_2 and D^{*0}_0, the 2+ and 0+ cubar P-wave states decaying to D+ pi-, are measured: mass_{D^{*0}_2} = (2460.4 +/- 1.2 +/- 1.2 +/- 1.9) MeV/c2, width_{D^{*0}_2} = (41.8 +/- 2.5 +/- 2.1 +/- 2.0) MeV, mass_{D^{*0}_0} = (2297 +/- 8 +/- 5 +/- 19) MeV/c2 and width_{D^{*0}_0} = (273 +/- 12 +/- 17 +/-45) MeV. The stated errors reflect the statistical and systematic uncertainties, and the uncertainty related to the assumed composition of signal events and the theoretical model.