Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2002-02-13
AIP Conf.Proc. 618 (2002) 159-168
Physics
High Energy Physics
High Energy Physics - Experiment
To appear in the Proceedings of the 9th Int'l Symposium on Heavy Flavor Physics; some references updated here
Scientific paper
10.1063/1.1478833
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 -> X_c 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 V_qq' governing quark mixing. We can thus extract |V_cb| from the inclusive semileptonic decay rate of B mesons, and |V_ub| from the lepton endpoint spectrum of B -> X_u l nu. Model dependence is reduced except for the assumption of quark-hadron duality. Finally, we update the classic measurement of |V_cb| from B -> D* l nu at zero recoil.
Briere Roy A.
for the CLEO Collaboration
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