A Fresh Look at the B Semileptonic Branching Ratio and Beauty Lifetimes
Matthias Neubert
Abstract
We discuss two problems in the theory of heavy-quark decays: an understanding of the semileptonic branching ratio of B mesons, and of the lifetime ratio τ(Λb)/τ(B0). We also present a model-independent study of spectator contributions to the lifetimes of beauty hadrons.
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