Two-loop contribution to the pion transition form factor vs. experimental data

Details Two-loop contribution to the pion transition form factor vs. experimental data Two-loop contribution to the pion transition form factor vs. experimental data

2009-09-28

arxiv.org/abs/0909.5128v3

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 2 figures, 3 tables. Presented by the first author at 3rd joint International HADRON STRUCTURE'09 Conference at Tatra

Scientific paper

We present predictions for the pion-photon transition form factor, derived with the help of light-cone sum rules and including the main part of the NNLO radiative corrections. We show that, when the Bakulev-Mikhailov-Stefanis (BMS) pion distribution amplitude is used, the obtained predictions agree well with the CELLO and the CLEO data. We found that no model distribution amplitude can reproduce the observed $Q^2$ growth of the new BaBar data, though the BMS model complies with several BaBar data points.

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