B→γeν transitions from QCD sum rules on the light-cone
نویسندگان
چکیده
منابع مشابه
|Vtd/Vts| from QCD Sum Rules on the Light-Cone
The dominant theoretical uncertainty in extracting |Vtd/Vts| from the ratio of branching ratios Rρ/ω ≡ B̄(B → (ρ, ω)γ)/B̄(B → Kγ) is given by the ratio of form factors ξρ ≡ T ∗ 1 (0)/T B→ρ 1 (0). We find ξρ = 1.17 ± 0.09 from QCD sum rules on the light-cone. Using QCD factorisation for the branching ratios, including the most dominant powersuppressed effects beyond QCD factorisation, and the curr...
متن کاملγeν Transitions from QCD Sum Rules on the Light - Cone Patricia
B → γeν transitions have recently been studied in the framework of QCD factorization. The attractiveness of this channel for such an analysis lies in the fact that, at least in the heavy quark limit, the only hadron involved is the B meson itself, so one expects a very simple description of the form factor in terms of a convolution of the B meson distribution amplitude with a perturbative kerne...
متن کاملB → π and B → K Transitions from QCD Sum Rules on the Light - Cone Patricia
FERMILAB–PUB–98/067–T (extended version) CERN–TH/98–215 hep-ph/9802394 Abstract: I calculate the form factors describing semileptonic and penguin-induced decays of B mesons into light pseudoscalar mesons. The form factors are calculated from QCD sum rules on the light-cone including contributions up to twist 4, radiative corrections to the leading twist contribution and SU(3)-breaking effects. ...
متن کاملπ with light - cone QCD sum rules
In this article, we take the point of view that the light scalar meson a0(980) is a conventional qq̄ state, and calculate the coupling constants ga0ηπ0 and ga0η′π0 with the light-cone QCD sum rules. The central value of the coupling constant ga0ηπ0 is consistent with the one extracted from the radiative decay φ(1020) → a0(980)γ → ηπ0γ. The central value and lower bound of the decay width Γa0→ηπ0...
متن کاملwith light - cone QCD sum rules Zhi -
In this article, we take the point of view that the light scalar meson a0(980) is a conventional qq̄ state, and calculate the coupling constants ga0ηπ0 and ga0η′π0 with the light-cone QCD sum rules. The central value of the coupling constant ga0ηπ0 is consistent with the one extracted from the radiative decay φ(1020) → a0(980)γ → ηπ0γ. The central value and lower bound of the decay width Γa0→ηπ0...
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ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2003
ISSN: 1029-8479
DOI: 10.1088/1126-6708/2003/04/029