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ISSN - 05503213, Nuclear Physics B, 2000, vol. 569, p. 158-182

Investigation of the e+e- → ωπ0 → π0π0γ reaction in the energy domain near the ø-meson

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

The e + e - → ωπ0 → π0π0γ process was investigated in the SND experiment at the VEPP-2M collider. A narrow energy interval near the ø-meson was scanned. The observed cross section reveals, at the level of three standard deviation, the interference effect caused by ø → π0π0γ decay. The cross-section parameters, as well as the real and imaginary parts of the ø-meson related amplitude, were measured. © 2000 Elsevier Science B.V. All rights reserved.