VA\tilde V correlator within the instanton vacuum model

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dc.creatorDorokhov, A. E.
dc.date2005-05-02
dc.date2005-05-07
dc.date.accessioned2026-07-07T12:25:05Z
dc.date.available2026-07-07T12:25:05Z
dc.descriptionThe correlator of vector and nonsinglet axial-vector currents in the external electromagnetic field is calculated within the instanton liquid model of QCD vacuum. In general the correlator has two Lorentz structures: longitudinal w_L and transversal w_T with respect to axial-vector index. Within the instanton model the saturation of the anomalous w_L structure is demonstrated. It is known that in the chiral limit the transversal structure w_T is free from perturbative corrections. In this limit within the instanton model we calculate the transversal invariant function w_T at arbitrary momentum transfer, q, and show the absence of power corrections to this structure at large q^2. Instead there arise the exponential corrections to w_T at large q^2 reflecting nonlocal properties of QCD vacuum. The slope of w_T at zero virtuality, the QCD vacuum magnetic susceptibility of the quark condensate and its momentum dependence are estimated.
dc.description16 pages, 7 figures (revised version, some typos are corrected)
dc.identifierhttps://arxiv.org/abs/hep-ph/0505007
dc.identifierhttp://arxiv.org/abs/hep-ph/0505007
dc.identifierEur.Phys.J.C42:309-317,2005
dc.identifierdoi:10.1140/epjc/s2005-02317-7
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/214516
dc.subjectHigh Energy Physics - Phenomenology
dc.titleVA\tilde V correlator within the instanton vacuum model
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