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Journal ArticleDOI

Chiral symmetry breaking and perturbative QCD

28 May 1981-Physics Letters B (North-Holland)-Vol. 101, Iss: 6, pp 423-426
TL;DR: 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.
Citations
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Journal ArticleDOI
TL;DR: In this article, the low energy representation of several Green's functions and form factors and of the na scattering amplitude are calculated in terms of a few constants, which may be identified with the coupling constants of a unique effective low energy Lagrangian.

3,277 citations

Journal ArticleDOI
TL;DR: In this paper, the total τ hadronic width can be accurately calculated using analyticity and the operator product expansion, and the theoretical analysis of this observable is updated to include all available perturbative and nonperturbative corrections.

497 citations

Journal ArticleDOI
TL;DR: In this paper, a detailed description of the method used and the results obtained for measuring various decay widths of the B-mesons into baryon-antibaryon pairs are presented.

363 citations

Journal ArticleDOI
TL;DR: In this article, the authors derived dispersive constraints on the shape of the form factors which describe the exclusive decays B → D(∗)l v for the ground-state doublet of heavy light mesons.

358 citations

Journal ArticleDOI
TL;DR: In this article, the authors derived dispersive constraints on the shape of the form factors which describe the exclusive decays of the ground-state doublet of heavy-light mesons.
Abstract: Dispersive constraints on the shape of the form factors which describe the exclusive decays B -> D^(*) l nu are derived by fully exploiting spin symmetry in the ground-state doublet of heavy-light mesons. The analysis includes all twenty B^(*) -> D^(*) semileptonic form factors. Heavy-quark symmetry, with both short-distance and 1/m_Q corrections included, is used to provide relations between the form factors near zero recoil. Simple one-parameter functions are derived, which describe the form factors in the semileptonic region with an accuracy of better than 2%. The implications of our results for the determination of |V_cb| are discussed.

303 citations

References
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Journal ArticleDOI
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.

3,874 citations

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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.

1,902 citations

Journal ArticleDOI
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.

432 citations

Journal ArticleDOI
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.

192 citations

Journal ArticleDOI
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.

45 citations