N. G. Stefanis, A. P. Bakulev, S. V. Mikhailov, A. V. Pimikov
We discuss, from the theoretical point of view, what a thought experiment to
measure the meson-photon transition form factor for a $\pi^0$, $\eta$, and
$\eta'$ could provide, exploring its implications. We consider possible
mechanisms that can eventually describe an auxetic pion-photon transition form
factor, as indicated by the $\gamma^*\gamma\to\pi^0$ \babar data at large-$Q^2$
and discuss possible explanations of the antithetic trend observed by the
\babar Collaboration for the non-strange part of the
$\gamma^*\gamma\to\eta(\eta')$ form factor. We also estimate the effect on the
transition form factors of a finite virtuality of the quasi-real photon in the
light-cone sum rules. The analysis also includes the CLEO data for
$\eta(\eta')$.
View original:
http://arxiv.org/abs/1202.1781
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