# Determination of $\mid V_{ub} \mid$ from the Measurement of the Inclusive Charmless Semileptonic Branching Ratio of b hadrons

Abstract : From a study of the kinematic properties of the final state produced in the semileptonic decays b-->X l nu, the inclusive charmless semileptonic branching ratio of b hadrons is measured. With a sam ple of 3.6 million hadronic Z decays recorded between 1992 and 1995 with the ALEPH detector at LEP, the value Br(b-->X_u l nu) is determined to be (1.73 +- 0.55_stat +- 0.55_syst)*10^{-3}, where X_u represents any charmless hadronic state and b is a mixture of b hadrons weighted by their production rates. This measurement yields the result |V_ub|^2= (18.68 +- 5.94_stat +- 5.94_syst +- 1 .45_HQE)*10^{-6}, where the last error comes from the conversion of the branching ratio to the CKM matrix element squared.
Document type :
Journal articles

Cited literature [19 references]

http://hal.in2p3.fr/in2p3-00003469
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Submitted on : Monday, March 29, 1999 - 10:58:57 AM
Last modification on : Thursday, December 16, 2021 - 2:10:09 PM
Long-term archiving on: : Friday, May 29, 2015 - 4:10:54 PM

### Identifiers

• HAL Id : in2p3-00003469, version 1

### Citation

R. Barate, D. Buskulic, D. Decamp, P. Ghez, C. Goy, et al.. Determination of $\mid V_{ub} \mid$ from the Measurement of the Inclusive Charmless Semileptonic Branching Ratio of b hadrons. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 1999, 6, pp.555-574. ⟨in2p3-00003469⟩

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