Measurement of Vub using b hadron semileptonic decays

Details Measurement of Vub using b hadron semileptonic decays Measurement of Vub using b hadron semileptonic decays

2001-07-08

arxiv.org/abs/hep-ex/0107016v1

Eur.Phys.J.C21:399-410,2001

Physics

High Energy Physics

High Energy Physics - Experiment

21 pages, 7 figures, Submitted to Eur.Phys.J.C

Scientific paper

10.1007/s100520100764

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 -> Xu l nu 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 -> Xu l) to be (1.63 +/- 0.53 +0.55/-0.62) x 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)) x 10^(-3). The last error represents the theoretical uncertainties related to the extraction of |Vub| from Br(b -> Xu l) using the Heavy Quark Expansion.

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