Measurement of |Vub| using b hadron semileptonic decay

Bailey, Ian Richard and Kartvelishvili, Vakhtang (2001) Measurement of |Vub| using b hadron semileptonic decay. European Physical Journal C: Particles and Fields, 21 (3). pp. 399-410. ISSN 1434-6044

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The magnitude of the CKM matrix element |Vub| is determined by measuring the inclusive charmless semileptonic branching fraction of beauty hadrons at OPAL based on b→Xuℓν event topology and kinematics. This analysis uses OPAL data collected between 1991 and 1995, which correspond to about four million hadronic Z decays. We measure Br( b→Xuℓν) to be (1.63±0.53+0.55−0.62)×10−3. The first uncertainty is the statistical error and the second is the systematic error. From this analysis, |Vub| is determined to be: |Vub| = (4.00 ± 0.65(stat)+0.67−0.76(sys) ± 0.19(HQE)) × 10−3. The last error represents the theoretical uncertainties related to the extraction of |Vub| from Br( b→Xuℓν) using the Heavy Quark Expansion.

Item Type: Journal Article
Journal or Publication Title: European Physical Journal C: Particles and Fields
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/2200/2201
Departments: Faculty of Science and Technology > Physics
ID Code: 82930
Deposited By: ep_importer_pure
Deposited On: 16 Nov 2016 11:08
Refereed?: Yes
Published?: Published
Last Modified: 15 Jan 2020 03:29

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