Study of the process $e^+e^-\toηγ$ in the center-of-mass energy range 1.07--2.00 GeV

Abstract

The $e^+e^-\toηγ$ cross section has been measured in the center-of-mass energy range 1.07--2.00 GeV using the decay mode $η\to 3π^0$, $π^0\to γγ$. The analysis is based on 36 pb$^{-1}$ of integrated luminosity collected with the SND detector at the VEPP-2000 $e^+e^-$ collider. The measured cross section of about 35 pb at 1.5 GeV is explained by decays of the $ρ(1450)$ and $ϕ(1680)$ resonances.

9 pages, 5 figures, 1 table