Journal ArticleDOI
Chiral symmetry breaking and perturbative QCD
TLDR
In this paper, it was shown that any combination of propagators that vanishes at zero momentum by virtue of Ward identifies is free of subtractions and satisfies a superconvergence relation.About:
This article is published in Physics Letters B.The article was published on 1981-05-28. It has received 124 citations till now. The article focuses on the topics: Chiral perturbation theory & Chiral symmetry breaking.read more
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The physics of hadrons
TL;DR: In this paper, the perturbative corrections to the moments of the hadronic mass distribution in τ decays are reconsidered and the exact order-α s 3 results and the resumption procedure of Le Diberder and Pich are compared with a partial resummation of perturbation series provided by the calculation of so-called renormalon chains.
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Threshold expansion of the sunset diagram
TL;DR: In this article, the authors developed an algorithm for analytical evaluation, within dimensional regularization, of arbitrary terms in the expansion of the two-loop sunset diagram with general masses m 1, m 2 and m 3 near its threshold.
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Nonperturbative methods in quantum chromodynamics
TL;DR: Several methods and models to treat nonperturbative effects in QCD are presented in this article, and the results show that QCD can be treated with non-perturbation effects.
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Moments of heavy quark current correlators at four-loop order in perturbative QCD
TL;DR: In this article, the first moment of the scalar and axial-vector current correlator in third order of the strong coupling constant αs was analyzed and the results can be used to reduce the theoretical uncertainty due to higher order corrections for the determination of fundamental parameters of QCD in the context of lattice calculations.
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Parity doubling among the baryons
TL;DR: In this paper, the authors explore the experimental evidence for parity doubling in the non-strange baryons, but little evidence among the strange ones and discuss potential explanations for this phenomenon, including suppression of families of chirally invariant operators by some other dynamical mechanism.
References
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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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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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QCD and resonance physics: The ϱ-ω mixing
TL;DR: In this paper, the authors extended the QCD-based approach to cover the ϱ-ω mixing problem and showed that virtual photon exchanges alone cannot explain the observed value of the mixing parameter.
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Spectral function sum rules in quantum chromodynamics: (I). Charged currents sector
TL;DR: In this article, the Weinberg sum rules of the algebra of currents are reconsidered in the light of quantum chromodynamics (QCD), and new finite-energy sum rules are derived which replace the old Weinberg sums rules.
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QCD contribution to vacuum polarization: The pseudoscalar unequal mass case
TL;DR: In this article, the perturbative and non-perturbative contributions to the vacuum polarization from the pseudoscalar current in the unequal mass case were computed to first order in α s.