Connections Between Inclusive and Exclusive Semileptonic B Decay
Mark B. Wise
Abstract
B decay sum rules relate exclusive B semileptonic decay matrix elements to forward B-meson matrix elements of operators in HQET. At leading order the operators that occur are the b-quark kinetic energy λ1 and chromomagnetic energy λ2. The latter is determined by the measured B*-B mass splitting. The derivation of these sum rules is reviewed and perturbative QCD corrections are discussed. A determination of λ1 and the energy of the light degrees of freedom in a B-meson, Λ, from semileptonic B decay data is presented. Future prospects for improving these sum rules are discussed.
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