EPS-HEP2019

Study of e+e−→e+e−η′ in double-tag mode at BABAR and measurement of the γ∗γ∗→η′ Transition Form Factor.

15 Jul 2019, 18:30

1h 30m

ICC - Arteveldeforum (Ghent)

Poster QCD and Hadronic Physics Wine & Cheese Poster Session

Speaker

Evgeny Kozyrev (Budker Institute of Nuclear Physics)

Description

We study the process $e^{+}{e}^{-}\to e^{+}{e}^{-}{\eta }^{\prime }$ in the double-tag mode and measure for the first time the ${\gamma }^{\ast }{\gamma }^{\ast }\to {\eta }^{\prime }$ transition form factor $F_{{\eta }^{\prime }}(Q_1^2,Q_2^2)$ 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.