Speaker
Kirill Sungurov
Description
The $e^+e^-\to\eta\gamma$ cross section is measured in the center-of-mass energy range from 980 MeV to 1060 MeV in the experiment with the SND detector at the VEPP-2000 $e^+e^-$ collider. The measurement is carried out in the $\eta\to2\gamma$ decay mode. It is based on data with an integrated luminosity of $73pb^{-1}$, recorded in 2018 and 2024, which exceeds statistics used for earlier measurements by more than 7 times. The measured cross section has the best accuracy to date. The product of the branching fractions $B(\phi\to e^+e^-)B(\phi\to\eta\gamma)$ is obtained from the fit of the cross section energy dependance
Author
Kirill Sungurov
