Abstract
A modified finite energy sum rules procedure is presented and applied for the phenomenological analysis of the difference of vector and axial-vector two-point current correlators. In the chiral limit π→evy decay axial formfactorF A, electro-magnetic difference of pion masses and the four quark condensates of dimensions six and eight are determined with improved accuracy, using the data on τ→v+nπ decays obtained by ARGUS collaboration. Our values forF A and Δm em are close to the measured ones, whileC 6<O 6> exceeds 2.5–3 times the value given by the vaccum saturation hypothesis.
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Kartvelishvili, V.G., Margvelashvili, M.V. Pion parameters and four quark condensates from τ-decay data. Z. Phys. C - Particles and Fields 55, 83–88 (1992). https://doi.org/10.1007/BF01558291
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DOI: https://doi.org/10.1007/BF01558291