Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 70, Issue 1-2, Pages 125-137Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-010-1466-4
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Constraints on the distribution amplitudes of the SU (f) (3) singlet eta (1) and octet eta (8) states are obtained from a comparison of the theoretical predictions for the eta gamma and eta'gamma electromagnetic transition form factors with experimental data of the CLEO and BaBar Collaborations. In calculations of the form factors F (eta(eta')gamma) (Q (2)) the power-suppressed corrections arising from the end-point integration regions x -> 0,1 are taken into account by employing the infrared renormalon approach. It is demonstrated that the power-suppressed corrections allow one to describe the data on the eta gamma and eta'gamma transitions within a framework of the SU (f) (3) octet-singlet basis using one mixing angle for both the physical states and decay constants.
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