Two-loop contribution to the pion transition form factor vs. experimental data
Abstract
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 growth of the new BaBar data, though the BMS model complies with several BaBar data points.
Keywords
Cite
@article{arxiv.0909.5128,
title = {Two-loop contribution to the pion transition form factor vs. experimental data},
author = {S. V. Mikhailov and N. G. Stefanis},
journal= {arXiv preprint arXiv:0909.5128},
year = {2015}
}
Comments
5 pages, 2 figures, 3 tables. Presented by the first author at 3rd joint International HADRON STRUCTURE'09 Conference at Tatranska Strba, Slovakia, August 30th - September 3rd, 2009. v2 Eqs. (9), (10) corrected; wrong reference tag removed. v3 Fig. 2 and Ref. [13] corrected