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ISSN - 10637761, EISSN - 10906509, Journal of Experimental and Theoretical Physics, 2003, vol. 97, p. 24-33

Measurement of the relative probability of the decay Φ → η′γ in the channel η′ → ηπ0π 0, η → γγ

Aulchenko V. M., Achasov M. N., Baru S. E., Beloborodov K. I., Berdyugin A. V., Bogdanchikov A. G., Bozhenok A. V., Bukin A. D., Bukin D. A., Vasilev A. V., Golubev V. B., Dimova T. V., Druzhinin V. P., Ivanchenko V. N., Koop I. A., Korol A. A., Koshuba S. V., Lysenko A. P., Otboev A. V., Pakhtusova E. V., Salnikov A. A., Serednyakov S. I., Sidorov V. A., Silagadze Z. K., Shary V. V., Shatunov Yu M.

The process e+e- → φ → η′γ, η′ → ηπ0π0, η → γγ is investigated by an SND detector in experiment on a VEPP-2M equipment with colliding electron-positron beams. The analysis of experimental data yields a value of B(Φ → η′γ) = (6.7-1.2 +5.0 ± 1.5) × 10-5 for the decay probability. Taking into account a previous measurement of this quantity by an SND detector in the decay channel η′ → π+π -η one finally obtains B(Φ → η′γ) = (6.7-2.4 +2.8 ± 0.8) × 10-5. © 2003 MAIK "Nauka/Interperiodica".