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ISSN - 10637788, EISSN - 1562692X, Physics of Atomic Nuclei, 1999, vol. 62, p. 442-444

Observation of the decays φ → π0π0γ and φ → π0ηγ in the SND experiment at VEPP-2M

Achasov M. N., Berdyugin A. V., Bozhenok A. V., Bukin A. D., Bukin D. A., Burdin S. V., Dimova T. V., Druzhinin V. P., Dubrovin M. S., Gaponenko I. A., Golubev V. B., Ivanchenko V. N., Koop I. A., Korol A. A., Koshuba S. V., Pakhtusova E. V., Serednyakov S. I., Shary V. V., Shatunov Yu M., Sidorov V. A., Silagadze Z. K., Skrinsky A. N.

Preliminary data on the processes e+e- → φ(1020) → π0π0γ, ηπ0γ studied in the SND experiment at VEPP-2M collider in Novosibirsk are presented. The branching ratios for the rare radiative φ → π0π0γ and φ → π0ηγ decays have been measured to be Br(φ → π0π0γ) = (1.1 ± 0.2) × 10-4 (Mππ > 800 MeV) and Br(φ → ηπ0γ) = (1.3 ± 0.5) × 10-4.