Open AccessMeasurement of the $\bar{B}$<sup>0</sup> → D<sup>*+</sup>ℓ<sup>-</sup>$\bar{v}$ Branching Fraction with a Partial Reconstruction Technique
Author(s) -
P. Sonnek
Publication year - 2009
Language(s) - English
Resource type - Reports
DOI - 10.2172/969220
Subject(s) - bar (unit) , physics , branching fraction , branching (polymer chemistry) , nuclear physics , meson , pion , chemistry , organic chemistry , meteorology
Presented is a precise measurement of the {bar B}{sup 0} {yields} D*{sup +}{ell}{sup -}{bar {nu}}{sub {ell}} branching fraction using 81.47 fb{sup -1} of data collected with the BABAR detector at the PEP-II e{sup +}e{sup -} storage ring at the Stanford Linear Accelerator Center. The measurement was performed by partially reconstructing the D*{sup +} meson from {bar B}{sup 0} {yields} D*{sup +}{ell}{sup -}{bar {nu}}{sub {ell}} decays using only the soft pion of the D*{sup +} {yields} D{sup 0}{pi}{sup +} decay to reconstruct its four vector. The branching fraction was measured to be {Beta}({bar B}{sup 0} {yields} D*{sup +}{ell}{sup -}{bar {nu}}{sub {ell}}) = (4.91 {+-} 0.01{sub stat} {+-} 0.15{sub syst})%