From a study of the kinematic properties of the final state produced in the semileptonic decays b → Xℓvℓ, the inclusive charmless semileptonic branching ratio of b hadrons is measured. With a sample of 3.6 million hadronic Z decays recorded between 1992 and 1995 with the ALEPH detector at LEP, the value Br(b → Xuℓvℓ) is determined to be (1.73 ± 0.55stat ± 0.55syst) × 10-3, where Xu represents any charmless hadronic state and b is a mixture of b hadrons weighted by their production rates. This measurement yields the result |Vub|2 = (18.68 ± 5.94stat ± 5.94syst ± 1.45HQE) × 10-6, where the last error comes from the conversion of the branching ratio to the CKM matrix element squared.

Barate, R., Buskulic, D., Decamp, D., Ghez, P., Goy, C., Lees, J., et al. (1999). Determination of |Vub| from the measurement of the inclusive charmless semileptonic branching ratio of b hadrons. EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 6(4), 555-574 [10.1007/s100520050366].

Determination of |Vub| from the measurement of the inclusive charmless semileptonic branching ratio of b hadrons

CARPINELLI, Massimo;
1999

Abstract

From a study of the kinematic properties of the final state produced in the semileptonic decays b → Xℓvℓ, the inclusive charmless semileptonic branching ratio of b hadrons is measured. With a sample of 3.6 million hadronic Z decays recorded between 1992 and 1995 with the ALEPH detector at LEP, the value Br(b → Xuℓvℓ) is determined to be (1.73 ± 0.55stat ± 0.55syst) × 10-3, where Xu represents any charmless hadronic state and b is a mixture of b hadrons weighted by their production rates. This measurement yields the result |Vub|2 = (18.68 ± 5.94stat ± 5.94syst ± 1.45HQE) × 10-6, where the last error comes from the conversion of the branching ratio to the CKM matrix element squared.
Articolo in rivista - Articolo scientifico
Physics
English
555
574
20
Barate, R., Buskulic, D., Decamp, D., Ghez, P., Goy, C., Lees, J., et al. (1999). Determination of |Vub| from the measurement of the inclusive charmless semileptonic branching ratio of b hadrons. EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 6(4), 555-574 [10.1007/s100520050366].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/390082
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