Strong interaction effects in semileptonic B decays
Abstract
Strong interaction effects are addressed in connection to extracting |Vcb|. A comprehensive approach is described not relying on a 1/mc expansion; it allows a percent accuracy without ad hoc assumptions about higher-order effects. An alternative to the MX2 variable is proposed improving convergence. Intrinsic hardness of integrated observables with a cut on E is discussed; it can be responsible for the behavior of <MX2> reported by BaBar. Consequences of the proximity to the `BPS' limit are considered.
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