Two-photon form factors of theπ0,η, andη′mesons in the chiral theory with resonances
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Abstract
We have developed a phenomenological approach which describes very well the ${\ensuremath{\pi}}^{0}$, $\ensuremath{\eta}$ and ${\ensuremath{\eta}}^{\ensuremath{'}}$ meson production in the two-photon interactions. The simultaneous description of the ${\ensuremath{\pi}}^{0}$, $\ensuremath{\eta}$ and ${\ensuremath{\eta}}^{\ensuremath{'}}$ meson two-photon form factors is consistent with data in the spacelike region, with the exception of the ${\ensuremath{\pi}}^{0}$ BABAR data. The obtained form factors are implemented in the event generator EKHARA and the simulated cross sections are presented. Uncertainties in the measured form factors coming from the model dependence in Monte Carlo simulations are studied. The model predictions for the form factor slopes at the origin are given and the high-${Q}^{2}$ limit is also discussed.
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