Moments of the hadronic invariant mass spectrum inB→Xclνdecays at Belle

Measurement of the moments of the hadronic invariant mass distribution in semileptonic B decays

m b from the Hadronic Invariant Mass Moments of Semileptonic Inclusive B decay

We calculate the hadronic tensor for inclusive semileptonic B → Xc l ν̄ decay to O(αs). This allows O(αs ΛQCD/mb) corrections to hadronic invariant mass observables to be directly evaluated with experimentally required cuts on phase space. Several moments of phenomenological interest are presented to order O(αs ΛQCD/mb) and O (

Vub from the Hadronic Invariant Mass Spectrum in Semileptonic B Decay

The hadronic invariant mass spectrum for the inclusive charmless semileptonic decay B → Xu e ν̄e is studied. Particular attention is paid to the region sH < mD, which may be useful for extracting the value of |Vub|. The sensitivity of the spectrum to the parameter Λ̄ ≡ mB − mb is explored. Perturbative QCD corrections to dΓ/dsH of order α 2 sβ0 are calculated. For sH ∼ Λ̄mb nonperturbative QCD eff...

Analysis of hadronic invariant mass spectrum in inclusive charmless semileptonic B decays

We make an analysis of the hadronic invariant mass spectrum in inclusive charmless semileptonic B meson decays in a QCD-based approach. The decay width is studied as a function of the invariant mass cut. We examine their sensitivities to the parameters of the theory. The theoretical uncertainties in the determination of |Vub| from the hadronic invariant mass spectrum are investigated. A strateg...

Hadronic Invariant Mass Spectrum in B → X u lν Decay with Lepton Energy Cut

We discuss the implications of charged lepton energy cut to the hadronic invariant mass spectrum in charmless semileptonic B decays. Charged-lepton energy cut is inevitable in order to remove secondary leptonic events such as b → c, τ → l, and to identify the chaged leptons at detectors experimentally. We consider three possible lepton energy cuts, Ecuts l = 0.6, 1.5, 2.3 GeV, and found that wi...