Constraints on distribution amplitudes of the η and η′ mesons in the light of new experimental results
Institute for Physical Problems, Baku State University, Z. Khalilov st. 23, 1148, Baku, Azerbaijan
Revised: 12 August 2010
Published online: 22 October 2010
Constraints on the distribution amplitudes of the SU f (3) singlet η 1 and octet η 8 states are obtained from a comparison of the theoretical predictions for the η γ and η′γ electromagnetic transition form factors with experimental data of the CLEO and BaBar Collaborations. In calculations of the form factors F η(η′)γ (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 η γ and η′γ transitions within a framework of the SU f (3) octet–singlet basis using one mixing angle for both the physical states and decay constants.
© Springer-Verlag / Società Italiana di Fisica, 2010