Form factor of the process γ^*γ^* -->π^o for small Virtuality of One of the Photons and QCD Sum Rules

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dc.creatorRadyushkin, A. V.
dc.creatorRuskov, R.
dc.date1995-07-28
dc.date1995-07-29
dc.date.accessioned2026-07-07T09:00:35Z
dc.date.available2026-07-07T09:00:35Z
dc.descriptionWe extend the QCD sum rule analysis of the γ^*γ^* -->π^o form factor into the region where one of the photons has small virtuality: q^2 << Q^2 > 1 GeV^2. In this kinematics, one should perform an additional factorization of short- and long-distance contributions. The extra long-distance sensitivity of the three-point amplitude is described by two-point correlators (bilocals), and the low-momentum dependence of the correlators involving composite operators of two lowest twists is extracted from auxiliary QCD sum rules. Our estimates for the form factor at q^2=0, Q^2 > 1 1 GeV^2 are in good agreement with existing experimental data.
dc.description6 pages, uses epsf.sty, 1 eps figure
dc.identifierhttps://arxiv.org/abs/hep-ph/9507447
dc.identifierhttp://arxiv.org/abs/hep-ph/9507447
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/148041
dc.subjectHigh Energy Physics - Phenomenology
dc.titleForm factor of the process γ^*γ^* -->π^o for small Virtuality of One of the Photons and QCD Sum Rules
dc.typetext

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