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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 1998, vol. 438, p. 441-445

Evidence of the φ → ηπ0γ decay

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

Signal of the rare radiative decay φ → ηπ0γ was observed in the SND experiment at VEPP-2M electron-positron collider. The result is based on the analysis of data, corresponding to a total integrated luminosity of 4pb-1, or 8 · 106 φ-mesons produced. The measured branching ratio of φ → ηπ0γ decay is equal to (0.83 ± 0.23) · 10-4. © 1998 Published by Elsevier Science B.V. All rights reserved.