Resonance estimates of O(p^6) low-energy constants and QCD short-distance constraints

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dc.creatorKnecht, Marc
dc.creatorNyffeler, Andreas
dc.date2001-06-04
dc.date2001-08-23
dc.date.accessioned2026-07-07T12:26:16Z
dc.date.available2026-07-07T12:26:16Z
dc.descriptionStarting from the study of the low-energy and high-energy behaviours of the QCD three-point functions <VAP>, <VVP> and <AAP>, several O(p^6) low-energy constants of the chiral Lagrangian are evaluated within the framework of the lowest meson dominance (LMD) approximation to the large-N_C limit of QCD. In certain cases, values that differ substantially from estimates based on a resonance Lagrangian are obtained. It is pointed out that the differences arise through the fact that QCD short-distance constraints are in general not correctly taken into account in the approaches using resonance Lagrangians. We discuss the implications of our results for the O(p^6) counterterm contributions to the vector form factor of the pion and to the decay π-> e ν_e γ, and for the pion-photon-photon transition form factor.
dc.description39 pages, Latex. v2: some typos corrected, references updated, version to appear in Eur. Phys. J. C
dc.identifierhttps://arxiv.org/abs/hep-ph/0106034
dc.identifierhttp://arxiv.org/abs/hep-ph/0106034
dc.identifierEur.Phys.J.C21:659-678,2001
dc.identifierdoi:10.1007/s100520100755
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/214828
dc.subjectHigh Energy Physics - Phenomenology
dc.titleResonance estimates of O(p^6) low-energy constants and QCD short-distance constraints
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