New CLEO Results for |Vcb| and |Vub|
Roy A. Briere
Abstract
We report recent measurements from CLEO of the first two moments of the photon energy spectrum for b -> s gamma decays and the hadronic recoil mass in B -> Xc l nu. These physical quantities allow one to fix non-perturbative parameters occurring in calculations based on HQET and QCD. Predictions for semileptonic decay rates within this same framework depend in addition on the CKM matrix elements Vqq' governing quark mixing. We can thus extract |Vcb| from the inclusive semileptonic decay rate of B mesons, and |Vub| from the lepton endpoint spectrum of B -> Xu l nu. Model dependence is reduced except for the assumption of quark-hadron duality. Finally, we update the classic measurement of |Vcb| from B -> D* l nu at zero recoil.
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