Study of the process $e^+e^-\toηγ\to 7γ$ in the energy range $\sqrt{s}$ = 1.07 -- 2 GeV

SND Collaboration, M. N. Achasov, A. Yu. Barnyakov, K. I. Beloborodov, A. V. Berdyugin, A. G. Bogdanchikov, A. A. Botov, V. S. Denisov, T. V. Dimova, V. P. Druzhinin, L. B. Fomin, A. G. Kharlamov, L. V. Kardapoltsev, A. N. Kyrpotin, I. A. Koop, A. A. Korol, D. P. Kovrizhin, A. P. Kryukov, A. S. Kupich, N. A. Melnikova, N. Yu. Muchnoi, A. E. Obrazovsky, E. V. Pakhtusova, E. A. Perevedentsev, K. V. Pugachev, Yu. A. Rogovsky, S. I. Serednyakov, Z. K. Silagadze, I. K. Surin, M. V. Timoshenko, Yu. V. Usov, V. N. Zhabin, V. V. Zhulanov, I. M. Zemlyansky, Yu. M. Shatunov, D. A. Shtol, A. N. Shukaev, E. A. Eminov

Published 2023-06-22Version 1

The $e^+e^-\to\eta\gamma$ cross section is measured in the center-of-mass energy range from 1.07 to 2.00 GeV in the decay channel $\eta\to 3\pi^0$, $\pi^0\to\gamma\gamma$. The data set with an integrated luminosity of 242 pb$^{-1}$ accumulated in the experiment with the SND detector at the VEPP-2000 $e^+e^-$ collider is analyzed.