The gluon content of the $η$ and $η^{\prime}$ mesons

Details The gluon content of the $η$ and $η^{\prime}$ mesons The gluon content of the $η$ and $η^{\prime}$ mesons

2004-09-16

arxiv.org/abs/hep-ph/0409198v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 6 figures consisting of 9 eps files. Needs here.sty. Typo in $beta_1$ corrected. Invited plenary talk presented by t

Scientific paper

We analyze power-suppressed contributions to singlet pseudoscalar $\eta$ and $\eta^{\prime}$ meson transition form factors. These corrections stem from endpoint singularities and help improve the agreement between QCD theory and the experimental data, in particular, at low-momentum transfers. Using the CLEO data, we extract information on the profile of the $\eta_1$ and $\eta_8$ distribution amplitudes in the $SU(3)_{F}$ octet-singlet basis employing both the one-angle and the two-angle mixing schemes. In the former scheme, we find good agreement with the CLEO data, while in the second case, our approach requires non-asymptotic profiles for these mesons.

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