Measurement of |Vcb| and |Vub| at LEP

Delphi has measured \V-ub\/\|V-cb\ using semileptonic decays with secondary hadronic systems having masses below the D mass, enriched in b --> ul (v) over bar transitions, and found the ratio to be 0.100 +/- 0.011 (stat.) +/- 0.018 (syst.) +/- 0.009 (model). Combined with other LEP measurements, a \V-ub\ of (41.2 +/- 3.9) x 10(-3) from a (B) over bar (0) --> D*(+)l (v) over bar decay rate study close to D*(+) zero recoil. The corresponding LEP averaged \V-ub\ is (38.4 +/- 3.3) x 10(-3). From the LEP semileptonic B branching fraction, a \V-ub\ of (40.75 +/- 2.08) x 10(-3) is obtained, giving a new LEP overall \V-ub\ of (40.2 +/- 1.9) x 10(-3).