Measurement of the Branching Fraction of Upsilon(4S) to B0B0bar
- SLAC
The authors report the first measurement of the branching fraction f{sub 00} for {Upsilon}(4S) {yields} B{sup 0}{bar B}{sup 0}. The data sample consists 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} {yields} D*{sup +}{ell}{sup -} {bar {nu}}{sub t} in which only the charged lepton and the soft pion from the decay D*{sup +} {yields} D{sup 0}{pi}{sup +} are reconstructed, they obtain f{sub 00} = 0.487 {+-} 0.010(stat) {+-} 0.008(sys). The result does not depend on the branching fractions of {bar B}{sup 0} {yields} D*{sup +}{ell}{sup -} {nu}{sub t} and D*{sup +} {yields} D{sup 0}{pi}{sup +} decays, on the ratio of the charged and neutral B meson lifetimes, nor on the assumption of isospin symmetry.
- Research Organization:
- Stanford Linear Accelerator Center (SLAC), Menlo Park, CA
- Sponsoring Organization:
- SC
- DOE Contract Number:
- AC02-76SF00515;
- OSTI ID:
- 839875
- Report Number(s):
- SLAC-PUB-11085
- Country of Publication:
- United States
- Language:
- English
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