Impact of Four-Quark Shape Functions on Inclusive B Decay Spectra

Abstract

It has recently been pointed out that a new class of subleading shape functions involving B-meson matrix elements of non-local four-quark operators contributes at order Lambda_{QCD}/m_b to B->X_u+l+nu decay distributions in the endpoint region. The corresponding functions f_u(omega) and f_v(omega) are estimated using the vacuum-insertion approximation. A numerical analysis of various B->X_u+l+nu decay spectra suggests that these power corrections are very small, below present theoretical uncertainties due to other subleading shape-function contributions.

8 pages, 2 figures; minor revisions and figure added; version to appear in Eur. Phys. J. C

References in corpus (2)

• Subleading Shape Functions in Inclusive B Decays
• Factorization for Power Corrections to B->Xs gamma and B-> Xu e nu

Cited by in corpus (11)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2018
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• Fit to Moments of Inclusive B->Xc lv and B-> Xs gamma Decay Distributions using Heavy Quark Expansions in the Kinetic Scheme
• Measurement of the Inclusive Electron Spectrum in Charmless Semileptonic B Decays Near the Kinematic Endpoint and Determination of |Vub|
• Enhanced Non-local Power Corrections to the B->X_s+gamma Decay Rate
• Measurement of |V_ub| near the endpoint of the electron momentum spectrum from semileptonic B-meson decays
• Determination of |Vub| from Measurements of the Electron and Neutrino Momenta in Inclusive Semileptonic B Decays
• Measurement of the inclusive electron spectrum from B meson decays and determination of |Vub|
• Role of "Intrinsic Charm" in Semi-Leptonic B-Meson Decays
• Large |Vub|: A challenge for the Minimal Flavour Violating MSSM