Summary
An instanton-induced pion wave function is constructed. It provides an intrinsick ⊥-dependence which suppresses soft virtual one-gluon exchanges and thus legitimates the perturbative QCD (pQCD) calculations of the pion electromagnetic form factor in the region of momentum transfers above the scaleQ c>(√3/(2√f))(1/ϱc)∼1 GeV, wheref=(2n c)(π2π 4c /2) is a packing fraction parameter, ϱc is an effective instanton size andn c is an effective density of instantons in the instanton vacuum of QCD.
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Dorokhov, A.E. Instanton-induced soft-pion wave function and hard-pion form factor. Nuov Cim A 109, 391–405 (1996). https://doi.org/10.1007/BF02731088
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DOI: https://doi.org/10.1007/BF02731088