Journal ArticleDOI
The role of instantons in generation of mesonic mass spectrum
B.V. Geshkenbein,B.L. Ioffe +1 more
TLDR
In this article, it was shown that in the dilute instanton gas approximation for quarks in the external instanton field Πsu = 0 for the vector and tensor currents and ΠSu≠0 for the axial current.About:
This article is published in Nuclear Physics.The article was published on 1980-04-21. It has received 76 citations till now. The article focuses on the topics: OZI rule & Vector meson.read more
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Instantons in QCD
Thomas Schäfer,Edward Shuryak +1 more
TL;DR: In this article, the authors review the theory and phenomenology of instantons in quantum chromodynamics (QCD) and provide a pedagogical introduction to semiclassical methods in quantum mechanics and field theory.
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THE ROLE OF INSTANTONS IN QUANTUM CHROMODYNAMICS (I). Physical vacuum
TL;DR: In this paper, the authors argue that the physical QCD vacuum is similar to the "instanton liquid" with density dn/dϱ = nc(gd(ϱ−ϱc), where n c ⋍ 8 · 10 −4 GeV 4 and ϱ c⋍ 1 600 GeV.
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Nucleon magnetic moments and magnetic properties of the vacuum in QCD
B.L. Ioffe,Andrei V. Smilga +1 more
TL;DR: In this paper, the magnetic moments of a proton and a neutron are calculated in the QCD sum rule approach, and the substantial role of the external electromagnetic field induced vacuum expectation values, the most important of which is connected with quark condensate magnetic susceptibility, is demonstrated.
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The area law of the Wilson loop and vacuum field correlators
Hans Günter Dosch,Yu. A. Simonov +1 more
TL;DR: In this paper, the Wilson loop average in background vacuum fields is expressed via the cumulant expansion in terms of irreducible correlators of the gluon field, assuming a fast falloff of the latter at large distance.
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Correlation functions in the QCD vacuum
TL;DR: Correlation functions are one of the key tools used to study the structure of the QCD vacuum and can be calculated using quantum-field-theory methods, such as lattice gauge theory as discussed by the authors.
References
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Journal ArticleDOI
QCD and resonance physics. theoretical foundations
TL;DR: In this paper, a systematic study is made of the non-perturbative effects in quantum chromodynamics, where the basic object is the two-point functions of various currents and the terms of this series are shown to be of two distinct types.
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Pseudoparticle Solutions of the Yang-Mills Equations
TL;DR: In this article, the authors find regular solutions of the four dimensional euclidean Yang-Mills equations and show that these solutions minimize locally the action integrals, which is finite in this case.
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QCD and Resonance Physics: Applications
TL;DR: In this article, the dispersion charmonium theory was extended to include power terms due to the nonperturbative effects of QCD, and an estimate for the gluonic vacuum expectation value was derived.
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Pion scattering lengths
TL;DR: In this article, a simple formula for pion scattering on any particle but a soft pion was given, and then extended to the more difficult case of pion-pion scattering.