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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 1997, vol. 415, p. 445-451

First observation of the decay φ → η′(958) γ

Akhmetshin R. R., Anashkin E. V., Arpagaus M., Aulchenko V. M., Banzarov V. S., Barkov L. M., Baru S. E., Bondar A. E., Chernyak D. V., Chertovskikh A. G., Danilov V. V., Dvoretsky A. S., Eidelman S. I., Fedotovich G. V., Gabyshev N. I., Grebeniuk A. A., Grigoriev D. N., Ivanov P. M., Kazanin V. F., Khazin B. I., Klimenkov A. V., Koop I. A., Kurdadze L. M., Kuzmin A. S., Logashenko I. E., Lukin P. A., Lysenko A. P., Maksimov A. V., Okhapkin V. S., Perevedentsev E. A., Polunin A. A., Popkov E. V., Ptitzyn V. I., Purlatz T. A., Root N. I., Ruban A. A., Ryskulov N. M., Shamov A. G., Shatunov Yu M., Shekhtman A. I., Shubin M. A., Shwartz B. A., Sidorov V. A., Skrinsky A. N., Smakhtin V. P., Snopkov I. G., Solodov E. P., Stepanov P. Yu, Sukhanov A. I., Yudin Yu V., Zverev S. G., Brown D. H., Roberts B. L., Thompson J. A., Hughes V. W.

The decay φ → η′γ has been observed by the CMD-2 detector at the e+e- collider VEPP-2M at Novosibirsk. Of 5.5 million produced φ's, six events of the φ → η′γ decay were selected with the expected background less than one event. The corresponding branching ratio is B(φ → η′γ) = 1.2+0.75-0.5 10-4. It is the first observation of this radiative decay. © 1997 Published by Elsevier Science B.V.