Role of "Intrinsic Charm" in Semi-Leptonic B-Meson Decays

Abstract

We discuss the role of so-called "intrinsic-charm" operators in semi-leptonic B-meson decays, which appear first at order 1/m_b^3 in the heavy quark expansion. We show by explicit calculation that -- at scales mu <= m_c -- the contributions from "intrinsic-charm" effects can be absorbed into short-distance coefficient functions multiplying, for instance, the Darwin term. Then, the only remnant of "intrinsic charm" are logarithms of the form ln(m_c^2/m_b^2), which can be resummed by using renormalization-group techniques. As long as the dynamics at the charm-quark scale is perturbative, alpha_s(m_c) << 1, this implies that no additional non-perturbative matrix elements aside from the Darwin and the spin-orbit term have to be introduced at order 1/m_b^3. Hence, no sources for additional hadronic uncertainties have to be taken into account. Similar arguments may be made for higher orders in the 1/m_b expansion.

arXiv comment14 pages, 1 figure, uses slashed.sty, slight modifications to match published version

References in corpus (27)

• QCD Predictions for Lepton Spectra in Inclusive Heavy Flavour Decays
• Inclusive Semileptonic B and Polarized Lambda_b Decays from QCD
• Differential Distributions in Semileptonic Decays of the Heavy Flavors in QCD
• B decays in the upsilon expansion
• Operator Product Expansion for Inclusive Semileptonic Decays in Heavy Quark Effective Field Theory
• Mass effects in muon and semileptonic b -> c decays
• Inclusive semileptonic B decays and the determination of |V_ub|
• Fit to Moments of Inclusive B->Xc lv and B-> Xs gamma Decay Distributions using Heavy Quark Expansions in the Kinetic Scheme
• Imprecated, yet Impeccable: On the Theoretical Evaluation of Gamma(B -> X_c \ell ν)
• Subleading Shape Functions in Inclusive B Decays
• Moments of semileptonic B decay distributions in the 1/m_b expansion
• Resummation of Nonperturbative Corrections to the Lepton Spectrum in Inclusive $B\to X\ell \bar{\nu }$ Decays
• Factorization for Power Corrections to B->Xs gamma and B-> Xu e nu
• Weak Annihilation and the Endpoint Spectrum in Semileptonic B Decays
• O(α_s^2) corrections to semileptonic decay b \to c l \bar ν_l
• B decay shape variables and the precision determination of |Vcb| and mb
• Inclusive Semi-leptonic B Decays to order 1/m_b^4
• Power corrections to B\to X_u l ν(X_sγ) decay spectra in the "shape-function" region
• Kinetic corrections to B -> X_c l nu at one loop
• Evading the CKM Hierarchy: Intrinsic Charm in B Decays
• Normalizing inclusive rare B decays
• On the nonperturbative charm effects in inclusive B -> X_c lνdecays
• Resumming Phase Space Logarithms in Inclusive Semileptonic $B$ Decays
• Shape Function Effects in B -> X_c l ν_l
• Can $B->X_c\ell \nu$ help us extract |V_{ub}| ?
• Impact of Four-Quark Shape Functions on Inclusive B Decay Spectra
• Shape Functions from B -> X_c \ell ν

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• Flavor Physics in the Quark Sector
• Theory of B -> K(*)l+l- decays at high q^2: OPE and quark-hadron duality
• Taming the higher power corrections in semileptonic B decays
• Revisiting Inclusive Decay Widths of Charmed Mesons
• The Two Roads to "Intrinsic Charm" in B Decays
• Pentaquarks from intrinsic charms in ${\Lambda }_b$ decays
• The Heavy Quark Expansion for Inclusive Semileptonic Charm Decays Revisited
• Semileptonic and leptonic $B$ decays, circa 2016
• Determination of the CKM matrix elements |V(xb)|
• Parton distribution functions and constraints on the intrinsic charm content of the proton using BHPS approach
• Progress on semi-leptonic $B_{(s)}$ decays
• Inclusive Semileptonic $b\to c\ell \bar{\nu }$ Decays to Order $1/m_b^5$
• Charming Darwin: the evolution of QCD parameters across different species
• Additional Information on Heavy Quark Parameters from Charged Lepton Forward-Backward Asymmetry