A Measurement of the |V(cb)| from anti-B(0) --> D*+- lepton- anti-lepton-neutrino
Collaboration
16 pages
Published in:
- Phys.Lett.B 359 (1995) 236-248
Report number:
- CERN-PPE-95-094,
- CERN-PPE-95-94
Experiments:
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Abstract: (Elsevier)
From approximately 3 million hadronic decays of Z bosons recorded with the aleph detector at lep , a sample of 410 ± 32 B 0 → D ∗+ ℓ − ν ℓ candidates is selected, where ℓ is either an electron or a muon. The differential decay rate dΓ ( B 0 → D ∗+ ℓ − ν ℓ ) dω from this sample is fitted, yielding a value for the product of the CKM matrix element | V cb | and the normalisation of the decay form factor at the point of zero recoil of the D ∗+ meson F ( ω = 1)| V cb | = (31.4 ± 2.3 stat ± 2.5 syst ) × 10 −3 . A value for | V cb | is extracted using theoretical calculations of the form factor normalisation, with the result | V cb | = (34.5 ± 2.5 stat ± 2.7 syst ± 1.5 theory ) × 10 −3 . From the integrated s the measured branching fraction is Br( B 0 → D ∗+ ℓ − ν ℓ ) = (5.18 ± 0.30 stat ± 0.62 syst ) %.- electron positron: colliding beams
- colliding beams: electron positron
- electron positron: annihilation
- annihilation: electron positron
- Z0: electroproduction
- electroproduction: Z0
- Z0: hadronic decay
- hadronic decay: Z0
- anti-B0: production
- production: anti-B0
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