QCD-Factorization of inclusive B decays and |Vub | ∗
نویسنده
چکیده
Recent progress in the theoretical description of inclusive B → Xu l − ν̄ decays in the shape-function region is reported. Finite moments of the shape function are related to HQET parameters. Event fractions for several experimental cuts are presented, with a particular emphasis on the hadronic variable P+ = EH − |~ PH |. The aim of this talk is to introduce the P+ spectrum, to compare it to the hadronic invariant mass spectrum and the charged-lepton energy spectrum, and to study the prospect of evaluating |Vub| in the presence of a large background from B → Xc decays.
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تاریخ انتشار 2004