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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A sum rule is derived for elastic scattering of hadrons at high energies which is in good agreement with experimental data on pp̄ available upto the maximum energy √ s = 2TeV . Physically, our sum rule reflects the way unitarity correlates and limits how large the elastic amplitude can be as a function of energy to how fast it decreases as a function of the momentum transfer. The universality of...
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A classic sum rule by Das et al. is extended to seven of the low-energy constants Ki, introduced by Urech, which parameterize electromagnetic corrections at chiral order O(ep). Using the spurion formalism, a simple convolution representation is shown to hold and the structure in terms of the chiral renormalization scale, the QCD renormalization scale and the QED gauge parameter is displayed. Th...
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We extend a recent sum rule calculation for inelastic quarkonium-hadron interactions to realistic parton distribution functions; we also include finite target-mass corrections. The last modification is shown effectively changes the gluon distribution function entering the r.h.s. of resulting sum rules. We also comment on applicability of sum-rule approach to large momenta n. In a recent study [...
متن کاملIntroduction into 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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ژورنال
عنوان ژورنال: Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
سال: 2010
ISSN: 1364-5021,1471-2946
DOI: 10.1098/rspa.2009.0680