Sum Rule fore-pScattering
نویسندگان
چکیده
منابع مشابه
Qcd Sum Rule Approach
In these lectures, I describe the techniques used within the QCD sum rule approach. The basic concepts of the approach are introduced using a simple model of quantum-mechanical oscillator in 2+1 dimensions. Then I discuss their field-theoretical extension and the construction of the operator product expansion for current correlators in QCD. The calculation of static parameters is illustrated on...
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We present a QCD sum rule calculation of the spin-symmetry violating universal function χ2(v · v′), which appears at order 1/mQ in the heavy quark expansion of meson form factors. This function vanishes in the standard approximation, where radiative effects are neglected. For the first time, the complete set of diagrams arising at order αs is evaluated. In particular, we find χ2(1) = −(3.8± 0.4...
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In 1967 Glashow, Schnitzer and Weinberg derived a sum rule in the soft pion and soft kaon limit relating the ∆I = 1 2 non-leptonic K → 2π amplitude to integrals over strange and non-strange spectral functions. Using the recent ALEPH data from τ -decay, we show that the sum rule, slightly modified to reduce contributions near the cut, yields the correct magnitude decay amplitude corresponding to...
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We use three-point QCD sum rules to calculate the form factors governing the rare exclusive decays B → (K,K) ll, B → (K,K) νν̄. We predict the branching ratios, the invariant mass distributions of the lepton pair for B → (K,K) ll, and the spectra of missing energy for B → (K,K) νν̄. The forward-backward asymmetry in B → Kll provides us with interesting tests of the Standard Model and its extensio...
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ژورنال
عنوان ژورنال: Progress of Theoretical Physics
سال: 1972
ISSN: 0033-068X
DOI: 10.1143/ptp.47.1054