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Study of the $ρ$, $ω$, $ϕ\toηγ\to 7γ$ Decays with an SND Detector on a VEPP-2M Collider

M. N. Achasov·S. E. Baru·K. I. Beloborodov·A. V. Berdyugin·A. V. Bozhenok·A. G. Bogdanchikov·D. A. Bukin·S. V. Burdin·A. V. Vasiljev·Yu. S. Velikzhanin·T. V. Dimova·V. P. Druzhinin·M. S. Dubrovin·D. I. Ganyushin·I. A. Gaponenko·V. B. Golubev·V. N. Ivanchenko·I. A. Koop·A. A. Korol·S. V. Koshuba·G. A. Kukartsev·E. V. Pakhtusova·A. A. Salnikov·S. I. Serednyakov·V. V. Shary·Yu. M. Shatunov·V. A. Sidorov·Z. K. Silagadze
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Abstract

The $e^+e^-\toηγ\to 7γ$ process was studied in the energy range $2E=600÷1060$ MeV with an SND detector on a VEPP-2M $e^+e^-$ collider. The decay branching ratios $B(ϕ\toηγ)=(1.343\pm 0.012\pm 0.055)\cdot 10^{-2}$, $B(ω\toηγ)=(4.60\pm 0.72\pm 0.19)\cdot 10^{-4}$, and $B(ρ\toηγ)=(2.69\pm 0.32\pm 0.16)\cdot 10^{-4}$ were measured.

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M. N. Achasov, S. E. Baru, K. I. Beloborodov, A. V. Berdyugin, A. V. Bozhenok, A. G. Bogdanchikov, D. A. Bukin, S. V. Burdin, A. V. Vasiljev, Yu. S. Velikzhanin, T. V. Dimova, V. P. Druzhinin, M. S. Dubrovin, D. I. Ganyushin, I. A. Gaponenko, V. B. Golubev, V. N. Ivanchenko, I. A. Koop, A. A. Korol, S. V. Koshuba, G. A. Kukartsev, E. V. Pakhtusova, A. A. Salnikov, S. I. Serednyakov, V. V. Shary, Yu. M. Shatunov, V. A. Sidorov, Z. K. Silagadze. 2002-02-15. Study of the $ρ$, $ω$, $ϕ\toηγ\to 7γ$ Decays with an SND Detector on a VEPP-2M Collider. https://doi.org/10.1134/1.1328437

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