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ISSN - 00213640, EISSN - 10906487, JETP Letters, 2008, vol. 88, p. 85-90

Search for the → π+π-γγ and → π+π-η decays with the CMD-2 detector

Aul'chenko V. M., Akhmetshin R. R., Banzarov B. Sh, Barkov L. M., Bashtovoi N. S., Bondar' A. E., Bragin A. V., Grebenyuk A. A., Grigor'ev D. N., Epifanov D. A., Zaitsev A. S., Ignatov F. V., Kazanin V. F., Karpov S. V., Koop I. A., Krokovny P. P., Kuz'Min A. S., Logashenko I. B., Lukin P. A., Mikhailov K. Yu, Nesterenko I. N., Otboev A. V., Okhapkin V. S., Perevedentsev E. A., Popov A. S., Redin S. I., Ruban A. A., Ryskulov N. M., Sibidanov A. L., Smakhtin V. P., Snopkov I. G., Solodov E. P., Fedotovich G. V., Khazin B. I., Shatunov Yu M., Shvarts B. A., Eidel'Man S. I., Yudin Yu V.

The → π+π-γγ and → π+π-η decays are sought in the experimental data obtained with the CMD-2 detector in the region of the -meson resonance. Upper limits ( → ππγγ)< 1.2 × 10-4 and ( → ππη) < 6.1 × 10-5 (both at a C.L. of 90%) are determined for the branching ratios of these decays. © 2008 Pleiades Publishing, Ltd.