B→π and B→K transitions from QCD sum rules on the light-cone
نویسندگان
چکیده
منابع مشابه
Bπ form factors from QCD Sum Rules
The H * Hπ form factor for H = B and D mesons is evaluated in a QCD sum rule calculation. We study the Borel sum rule for the three point function of two pseudoscalar and one vector meson currents up to order four in the operator product expansion. The double Borel transform is performed with respect to the heavy meson momenta. We discuss the momentum dependence of the form factors and two diff...
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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 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. ...
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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 کاملQCD Sum Rules on the Light-Cone, Factorisation and SCET
The accurate calculation of weak heavy-to-light form factors is crucial for the determination of CKM matrix elements from experimental data on B decays. In SCET, the soft-collinear effective theory, these form factors can, in the heavy quark limit, be split into a factorisable part that is calculable in perturbation theory, and a nonfactorisable part that observes certain spin-symmetries. I dis...
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ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 1998
ISSN: 1029-8479
DOI: 10.1088/1126-6708/1998/09/005