| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 8187378 | Physics Letters B | 2017 | 5 Pages |
Abstract
We study the transition of non-perturbative to perturbative QCD in situations with possible violations of scaling limits. To this end we consider the singly- and doubly-virtual pion transition form factor Ï0âγγ at all momentum scales of symmetric and asymmetric photon momenta within the Dyson-Schwinger/Bethe-Salpeter approach. For the doubly virtual form factor we find good agreement with perturbative asymptotic scaling laws. For the singly-virtual form factor our results agree with the Belle data. At very large off-shell photon momenta we identify a mechanism that introduces quantitative modifications to Efremov-Radyushkin-Brodsky-Lepage scaling.
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Authors
Gernot Eichmann, Christian S. Fischer, Esther Weil, Richard Williams,