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arXiv · 1808.08038

Measurement of the $γ^{\star}γ^{\star} \to η'$ transition form factor

The BaBar collaboration
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Abstract

We study the process $e^+e^-\to e^+e^- η'$ in the double-tag mode and measure for the first time the $γ^{\star}γ^{\star} \to η'$ transition form factor $F_{η'}(Q_1^2, Q_2^2)$ in the momentum-transfer range \mbox{2 $<Q_1^2, Q_2^2<$ 60 GeV$^2$}. The analysis is based on a data sample corresponding to an integrated luminosity of around 469 fb$^{-1}$ collected at the PEP-II $e^+e^-$ collider with the BaBar detector at center-of-mass energies near 10.6 GeV.

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The BaBar collaboration. 2018-11-22. Measurement of the $γ^{\star}γ^{\star} \to η'$ transition form factor. https://doi.org/10.1103/physrevd.98.112002

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