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Title: | Measurement of the relative branching fractions of ¯¯¯B→D/D∗/D**l−¯νl decays in events with a fully reconstructed B meson |
Author: | Garra Ticó, Jordi Graugés Pous, Eugeni BABAR Collaboration |
Keywords: | Física de partícules Experiments Mesons (Física nuclear) Particle physics Experiments Mesons (Nuclear physics) |
Issue Date: | 4-Sep-2007 |
Publisher: | American Physical Society |
Abstract: | We determine the relative branching fractions of semileptonic B decays to charmed final states. The measurement is performed on the recoil from a fully reconstructed B meson in a sample of 362 × 10 6 B ¯¯¯ B pairs collected at the Υ ( 4 S ) resonance with the BABAR detector. A simultaneous fit to a set of discriminating variables is performed on a sample of ¯¯¯ B → D X ℓ − ¯ ν ℓ decays to determine the contributions from the different channels. We measure Γ ( B − → D ℓ − ¯ ν ℓ ) / Γ ( B − → D X ℓ − ¯ ν ℓ ) = 0.227 ± 0.014 ± 0.016 , Γ ( B − → D ∗ ℓ − ¯ ν ℓ ) / Γ ( B − → D X ℓ − ¯ ν ℓ ) = 0.582 ± 0.018 ± 0.030 , and Γ ( B − → D ** ℓ − ¯ ν ℓ ) / Γ ( B − → D X ℓ − ¯ ν ℓ ) = 0.191 ± 0.013 ± 0.019 for the charged B sample, and Γ ( ¯¯¯¯¯ B 0 → D ℓ − ¯ ν ℓ ) / Γ ( ¯¯¯¯¯ B 0 → D X ℓ − ¯ ν ℓ ) = 0.215 ± 0.016 ± 0.013 , Γ ( ¯¯¯¯¯ B 0 → D ∗ ℓ − ¯ ν ℓ ) / Γ ( ¯¯¯¯¯ B 0 → D X ℓ − ¯ ν ℓ ) = 0.537 ± 0.031 ± 0.036 , and Γ ( ¯¯¯¯¯ B 0 → D ** ℓ − ¯ ν ℓ ) / Γ ( ¯¯¯¯¯ B 0 → D X ℓ − ¯ ν ℓ ) = 0.248 ± 0.032 ± 0.030 for the neutral B sample, where uncertainties are statistical and systematic, respectively. |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.76.051101 |
It is part of: | Physical Review D, 2007, vol. 76, num. 5, p. 051101(R) |
URI: | http://hdl.handle.net/2445/131450 |
Related resource: | https://doi.org/10.1103/PhysRevD.76.051101 |
ISSN: | 1550-7998 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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