From approximately 3 million hadronic decays of Z bosons recorded with the aleph detector at lep, a sample of 410 ± 32 B0 → D*+ℓ-νℓ candidates is selected, where ℓ is either an electron or a muon. The differential decay rate dΓ (B0 → D*+ℓ-νℓ) dω from this sample is fitted, yielding a value for the product of the CKM matrix element |Vcb| and the normalisation of the decay form factor at the point of zero recoil of the D*+ meson F(ω = 1)|Vcb| = (31.4 ± 2.3stat ± 2.5syst) × 10-3. A value for |Vcb| is extracted using theoretical calculations of the form factor normalisation, with the result |Vcb| = (34.5 ± 2.5stat ± 2.7syst ± 1.5theory) × 10-3. From the integrated s the measured branching fraction is Br(B0 → D*+ℓ-νℓ) = (5.18 ± 0.30stat ± 0.62syst)%.

Buskulic, D., Casper, D., Debonis, I., Decamp, D., Ghez, P., Goy, C., et al. (1995). A measurement of |Vcb| from B0 → D*+ℓ-νℓ. PHYSICS LETTERS. SECTION B, 359(1-2), 236-248 [10.1016/0370-2693(95)01021-H].

A measurement of |Vcb| from B0 → D*+ℓ-νℓ

CARPINELLI, Massimo;
1995

Abstract

From approximately 3 million hadronic decays of Z bosons recorded with the aleph detector at lep, a sample of 410 ± 32 B0 → D*+ℓ-νℓ candidates is selected, where ℓ is either an electron or a muon. The differential decay rate dΓ (B0 → D*+ℓ-νℓ) dω from this sample is fitted, yielding a value for the product of the CKM matrix element |Vcb| and the normalisation of the decay form factor at the point of zero recoil of the D*+ meson F(ω = 1)|Vcb| = (31.4 ± 2.3stat ± 2.5syst) × 10-3. A value for |Vcb| is extracted using theoretical calculations of the form factor normalisation, with the result |Vcb| = (34.5 ± 2.5stat ± 2.7syst ± 1.5theory) × 10-3. From the integrated s the measured branching fraction is Br(B0 → D*+ℓ-νℓ) = (5.18 ± 0.30stat ± 0.62syst)%.
Articolo in rivista - Articolo scientifico
Physics
English
236
248
13
Buskulic, D., Casper, D., Debonis, I., Decamp, D., Ghez, P., Goy, C., et al. (1995). A measurement of |Vcb| from B0 → D*+ℓ-νℓ. PHYSICS LETTERS. SECTION B, 359(1-2), 236-248 [10.1016/0370-2693(95)01021-H].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/390315
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