منابع مشابه
Π-η Mixing from Qcd Sum Rules
The q2 dependence of the π-η mixing amplitude is examined with the use of QCD sum rules. The linear slope of the mixing function θ(q2) is found to be much smaller than that for ρ-ω mixing. Thus the mixing amplitude is approximately the same in the space-like region as in the time-like one, and one may neglect the q2 dependence of the mixing. A comparison between a hadron-meson, an effective chi...
متن کاملRho Meson Properties in Nuclear Matter from Qcd Sum Rules∗
We study the properties of rho mesons in nuclear matter by means of QCD sum rules at finite density. For increased sensitivity, we subtract out the vacuum contributions. With the spectral function as estimated in the literature, these subtracted sum rules are found to be not well satisfied. We suppose that Landau singularities from higher resonance states in the nearby region in this channel ar...
متن کاملHeavy-meson form factors from QCD sum rules.
A consistent framework is developed for studying hadronic form factors of heavy mesons using QCD sum rules in the heavy quark effective theory, including the-next-to-leading order renormalization group improvement. Sum rules are derived for the asymptotic value of the meson decay constant jp and for the universal Isgur-Wise form factor. It is shown that renormalization group effects considerabl...
متن کاملGaussian Sum-Rules, Scalar Gluonium, and Instantons
Gaussian sum-rules relate a QCD prediction to a two-parameter Gaussian-weighted integral of a hadronic spectral function, providing a clear conceptual connection to quarkhadron duality. In contrast to Laplace sum-rules, the Gaussian sum-rules exhibit enhanced sensitivity to excited states of the hadronic spectral function. The formulation of Gaussian sum-rules and associated analysis techniques...
متن کاملScalar-Meson-Baryon Coupling Constants in QCD Sum Rules
The external-field QCD Sum Rules method is used to evaluate the coupling constants of the light-isoscalar scalar meson (“σ” or ǫ) to the Λ, Σ, and Ξ baryons. It is shown that these coupling constants as calculated from QCD Sum Rules are consistent with SU(3)-flavor relations, which leads to a determination of the F/(F + D) ratio of the scalar octet assuming ideal mixing: we find αs ≡ F/(F + D) ...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1984
ISSN: 0370-2693
DOI: 10.1016/0370-2693(84)90613-0