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

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.

preprint2009arXivOpen access
S. V. MikhailovN. G. Stefanis
hep-ph
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Open access2 authors1 topic
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S. V. MikhailovN. G. Stefanis

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