Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5495304 | Physics Letters B | 2016 | 7 Pages |
Abstract
The annihilation/production process e++eââÏ++Ïâ is studied with respect to the universal perturbative QCD (pQCD) predictions. Sub-leading contributions are considered together with the universal leading pQCD amplitudes such that the matrix elements of the Ï-meson electromagnetic current satisfy the constraint from the light-front angular condition. The data from the BaBar collaboration for the time-like Ï-meson form factors at s=10.58GeV puts a stringent test to the onset of asymptotic pQCD behavior. The e++eââÏ++Ïâ cross-section for s between 60GeV2 and 160GeV2 is predicted where the sub-leading contributions are still considerable.
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Authors
J.P.B.C. de Melo, Chueng-Ryong Ji, T. Frederico,