Theoretical Uncertainties in Gamma_sl(b->u)
classification
✦ hep-ph
keywords
theoreticaluncertaintiesbarsdecayeffectselementerrorexisting
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I review the existing theoretical uncertainties in relating the semileptonic decay width in b->u transitions to the underlying Kobayashi-Maskawa mixing element |V_ub|. The theoretical error bars are only a few percent in |V_ub|, with uncertainties from the impact of the nonperturbative effects nearly negligible.
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