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arXiv · hep-ph/0606284

On the two-photon contributions to $e^+e^-\toηγ$ and $e^+e^-\toη^\primeγ$

Z. K. Silagadze
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Abstract

Motivated by recent BABAR measurements of the $γ^*\toγη$ and $γ^*\toγη^\prime $ transition form factors, we estimate two-photon exchange contributions to the corresponding cross sections. By using a phenomenological model, based on the vector meson dominance, it is argued that the expected contributions are small enough not to effect the BABAR results. As a by product we predict $Br(η^\prime\toμ^+μ^-)= (1.4\pm 0.2)\times 10^{-7}$. Our results might be useful also in high precision calculations of radiative corrections to the Dalitz decays of pseudoscalar mesons.

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Z. K. Silagadze. 2006-06-28. On the two-photon contributions to $e^+e^-\toηγ$ and $e^+e^-\toη^\primeγ$. https://doi.org/10.1103/physrevd.74.054003

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