A new precise measurement of |Vcb| and of the branching ratio BR(B̄0 → D*+ℓ-v̄ℓ) has been performed using a sample of about 5000 semileptonic decays B̄0 → D*+ℓ-v̄ℓ, selected by the DELPHI detector at LEP I by tagging the soft pion from D*+ → D0π+. The results are: Vcb = (39.0 ± 1.5 (stat.)-2.6 +2.5 (syst. exp.) ± 1.3 (syst. th.)) × 10-3, BR(B̄0 → D*+ℓ-v̄ℓ) = (4.70 ± 0.13 (stat.)-0.31 +0.36 (syst. exp.))%. The analytic dependencies of the differential cross-section and of the Isgur-Wise form factor as functions of the variable w = vB0 · vD* have also been obtained by unfolding the experimental resolution

Abreu, P., Adam, W., Adye, T., Adzic, P., Albrecht, Z., Alderweireld, T., et al. (2001). Measurement of Vcb from the decay process B̄0 → D*+ℓ-v̄. PHYSICS LETTERS. SECTION B, 510(1-4), 55-74 [10.1016/S0370-2693(01)00569-X].

Measurement of Vcb from the decay process B̄0 → D*+ℓ-v̄

CALVI, MARTA;NEGRI, PIETRO;PAGANONI, MARCO;PULLIA, ANTONINO;RAGAZZI, STEFANO;Tabarelli, T;Terranova, F;
2001

Abstract

A new precise measurement of |Vcb| and of the branching ratio BR(B̄0 → D*+ℓ-v̄ℓ) has been performed using a sample of about 5000 semileptonic decays B̄0 → D*+ℓ-v̄ℓ, selected by the DELPHI detector at LEP I by tagging the soft pion from D*+ → D0π+. The results are: Vcb = (39.0 ± 1.5 (stat.)-2.6 +2.5 (syst. exp.) ± 1.3 (syst. th.)) × 10-3, BR(B̄0 → D*+ℓ-v̄ℓ) = (4.70 ± 0.13 (stat.)-0.31 +0.36 (syst. exp.))%. The analytic dependencies of the differential cross-section and of the Isgur-Wise form factor as functions of the variable w = vB0 · vD* have also been obtained by unfolding the experimental resolution
Articolo in rivista - Articolo scientifico
LEP
English
2001
510
1-4
55
74
none
Abreu, P., Adam, W., Adye, T., Adzic, P., Albrecht, Z., Alderweireld, T., et al. (2001). Measurement of Vcb from the decay process B̄0 → D*+ℓ-v̄. PHYSICS LETTERS. SECTION B, 510(1-4), 55-74 [10.1016/S0370-2693(01)00569-X].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/187998
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