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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2000, vol. 479, p. 53-58

The φ → ηπ0γ decay

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

Rare radiative decay φ → ηπ0γ was studied with SND detector at VEPP-2M electron-positron collider and its branching ratio was measured: B(φ → ηπ0γ) = (0.88 ± 0.14 ± 0.09) · 10-4. Significant contribution of the a0(980)γ intermediate state was observed in the decay. The result is based on total integrated luminosity corresponding to 2 · 107 produced φ mesons. (C) 2000 Elsevier Science B.V.