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Achasov, M. N.; Barnyakov, A. Yu; Beloborodov, K. I.; Berdyugin, A. V.; Berkaev, D. E.; Bogdanchikov, A. G.; Botov, A. A.; Dimova, T. V.; Druzhinin, V. P.; Kirpotin, A. N.; Kardapoltsev, L. V.; Kasaev, A. S.; Kharlamov, A. G.; Koop, I. A.; Korol, A. A.; Kovrizhin, D. P.; Kupich, A. S.; Martin, K. A.; Melnikova, N. A.; Muchnoy, N. Yu; Obrazovsky, A. E.; Pakhtusova, E. V.; Pugachev, K. V.; Rabusov, D. V.; Rogovsky, Yu. A.; Senchenko, A. I.; Serednyakov, S. I.; Shatilov, D. N.; Shatunov, Yu. M.; Shtol, D. A.; Shwartz, D. B.; Silagadze, Z. K.; Surin, I. K.; Timoshenko, M. V.; Usov, Yu. V.; Zhabin, V. N.; Zhulanov, V. V.
The European physical journal. C, Particles and fields, 02/2022, Letnik: 82, Številka: 2Journal Article
The process e + e - → η η γ is studied in the center-of-mass energy range 1.17–2.00 GeV using data with an integrated luminosity of 201 pb - 1 collected by the SND detector at the VEPP-2000 e + e - collider. The e + e - → η η γ cross section is measured for the first time. It is shown that the dominant mechanism of this reaction is the transition through the ϕ η intermediate state. Our result on the e + e - → η η γ cross section is consistent with the e + e - → ϕ η measurement in the ϕ → K + K - mode. The search for radiative processes contributing to the e + e - → η η γ cross section is performed, and no significant signal is observed.
