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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2000, vol. 473, p. 337-342

New measurement of the rare decay φ → η'γ with CMD-2

Akhmetshin R. R., Anashkin E. V., Arpagaus M., Aulchenko V. M., Banzarov V. Sh, Barkov L. M., Bashtovoy N. S., Bondar A. E., Bondarev D. V., Bragin A. V., Chernyak D. V., Eidelman S. I., Fedotovitch G. V., Gabyshev N. I., Grebeniuk A. A., Grigoriev D. N., Hughes V. W., Ivanov P. M., Karpov S. V., Kazanin V. F., Khazin B. I., Koop I. A., Korostelev M. S., Krokovny P. P., Kurdadze L. M., Kuzmin A. S., Logashenko I. B., Lukin P. A., Lysenko A. P., Mikhailov K. Yu, Nesterenko I. N., Okhapkin V. S., Otboev A. V., Perevedentsev E. A., Polunin A. A., Popov A. S., Purlatz T. A., Root N. I., Ruban A. A., Ryskulov N. M., Shamov A. G., Shatunov Yu M., Shekhtman A. I., Shwartz B. A., Sibidanov A. L., Sidorov V. A., Skrinsky A. N., Smakhtin V. P., Snopkov I. G., Solodov E. P., Stepanov P. Yu, Sukhanov A. I., Thompson J. A., Titov V. M., Valishev A. A., Yudin Yu V., Zverev S. G.

A new measurement of the rare decay φ → η'γ performed with the CMD-2 detector at the VEPP-2M collider in Novosibirsk is described. Of the data sample corresponding to the integrated luminosity of 14.5 pb-1, twenty one events have been selected in the mode η' → π+ π- η, η → γγ. The following branching ratio was obtained: B(φ → η'γ) =(8.2-1.9/+2.1 ± 1.1) · 10-5. (C) 2000 Published by Elsevier Science B.V.