Speaker
Evgeny Kozyrev
(Budker Institute of Nuclear Physics)
Description
We study the process $e^+e^-\to e^+e^- \eta'$ in the double-tag mode and measure for the first time the $\gamma^*\gamma^* \to \eta'$ transition form factor $F_{\eta'}(Q_1^2, Q_2^2)$ in the momentum-transfer range $2< Q_{1,2}^2<60$ GeV$^2$. The analysis is based on data with an integrated luminosity of about 470 fb$^{-1}$ collected at the PEP-II $e^+e^-$ collider with the BABAR detector at center-of-mass energies near 10.6 GeV. The results for the form factor are compared with the predictions based on pQCD and VMD.
Authors
Fabio Anulli
(Sapienza Universita e INFN, Roma I (IT))
Evgeny Kozyrev
(Budker Institute of Nuclear Physics)
