|Vcb|, |Vub|, and Hqet at Cleo
Karl M. Ecklund (for the CLEO Collaboration)
TL;DR
This paper presents improved measurements of the CKM matrix elements Vcb and Vub from semileptonic B decays, utilizing novel techniques like the b -> s gamma spectrum to enhance precision.
Contribution
It introduces new methods to reduce uncertainties in measuring Vcb and Vub, including the use of the b -> s gamma spectrum and q^2 dependence analysis.
Findings
More precise values of Vcb and Vub obtained
Reduced hadronic uncertainties in semileptonic B decay measurements
Enhanced understanding of CKM matrix elements
Abstract
I report results from the CLEO collaboration on semileptonic B decays, highlighting measurements of the Cabibbo-Kobayashi-Maskawa matrix elements Vcb and Vub. I describe the techniques used to obtain the recent improvements in precision for these measurements, including the use of the b -> s gamma photon spectrum to reduce hadronic uncertainties in semileptonic B decays. I also report new measurements of Vcb using the inclusive semileptonic branching fraction BF(B -> X e nu) and of Vub through study of the q^2 dependence of B -> pi l nu and B -> rho l nu.
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