Abstract
The authors report a measurement of the branching fraction e{sup +}e{sup -} --> B{sup 0}{bar B}{sup 0} with a data sample of 81.7 fb{sup -1} collected at the {Upsilon}(4S) resonance with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} storage ring. Using partial reconstruction of the decay {bar B}{sup 0} --> D*{sup +}{ell}{sup -}{bar {nu}}{sub {ell}} they obtain a preliminary result of f{sub 00} = 0.486 {+-} 0.010(stat.) {+-} 0.009(sys.). The result does not depend on branching fractions of the {bar B}{sup 0} and the D*{sup +} decay chains, on the simulated reconstruction efficiency, on the ratio of the charged and neutral B meson lifetimes, nor on assumption of isospin symmetry. This measurement is important for normalizing many B decay branching fractions, and contributes to an understanding of isospin violation in the {Upsilon}(4S) system.
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