M. Acciarri et al., MEASUREMENT OF THE INCLUSIVE CHARMLESS SEMILEPTONIC BRANCHING FRACTION OF BEAUTY HADRONS AND A DETERMINATION OF VERTICAL-BAR-V-UB-VERTICAL-BAR AT LEP, Physics letters. Section B, 436(1-2), 1998, pp. 174-186
A measurement of the inclusive charmless semileptonic branching fracti
on of beauty hadrons, b --> X-u l nu, has been performed using almost
two million hadronic Z decays collected by the L3 experiment at LEP, y
ielding the result: Br(b --> X-u l nu) = (3.3 +/- 1.0 +/- 1.7) x 10(-3
). The first uncertainty is statistical and the second is systematic.
The modulus of the Cabibbo-Kobayashi-Maskawa matrix element V-ub extra
cted from this measurement is: \V-ub\ = (6.0(-1.0-1.9)(+0.8+1.4) +/- 0
.2) x 10(-3), where the uncertainties are statistical, systematic and
theoretical, respectively. (C) 1998 Elsevier Science B.V. All rights r
eserved.