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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 1997, vol. 415, p. 452-462

Search for rare φ decays in π+π-γ final state

Akhmetshin R. R., Aksenov G. A., Anashkin E. V., Arpagaus M., Astakhov V. A., Baibusinov B. O., Banzarov V. S., Barkov L. M., Bondar A. E., Chernyak D. V., Eidelman S. I., Fedotovich G. V., Gabyshev N. I., Grebeniuk A. A., Grigoriev D. N., Ivanov P. M., Khazin B. I., Koop I. A., Kurdadze L. M., Kuzmin A. S., Logashenko I. B., Lukin P. A., Lysenko A. P., Maksimov A. V., Merzlyakov Yu I., Nesterenko I. N., Okhapkin V. S., Perevedentsev E. A., Popkov E. V., Purlatz T. A., Root N. I., Ruban A. A., Ryskulov N. M., Shubin M. A., Shwartz B. A., Sidorov V. A., Skrinsky A. N., Smakhtin V. P., Snopkov I. G., Solodov E. P., Sukhanov A. I., Titov V. M., Yudin Yu V., Brown D. H., Roberts B. L., Thompson J. A., Valine C. M., Hughes V. W.

A search for φ radiative decays has been performed using a data sample of about 2.0 million φ decays collected by the CMD-2 detector at VEPP-2M collider in Novosibirsk. From the selected e+e- → π+π-γ events the following results were obtained: B(φ → f0(980)γ) < 1 × 10-4 for destructive and B(φ → f0(980)γ) < 7 × 10-4 for constructive interference with the Bremsstrahlung process respectively, B(φ → γ → π+π-γ) < 3 × 10-5 for Eγ > 20 MeV, B(φ → ργ) < 7 × 10-4. From the selected e+e- → μ+μ-γ events B(φ → μ+μ-γ) = (2.3 ± 1.0) × 10-5 has been obtained for Eγ > 20 MeV. The upper limit on the P,CP-violating decay η → π+π- has also been placed: B(η → π+π-) < 9 × 10-4. All upper limits are at 90% C.L. © 1997 Published by Elsevier Science B.V.