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ISSN - 05503213, Nuclear Physics B, 2001, vol. 600, p. 3-20

Search for the radiative decay η→π0γγ in the SND experiment at VEPP-2M

Achasov M. N., Beloborodov K. I., Berdyugin A. V., Bozhenok A. V., Bogdanchikov A. G., Bukin D. A., Burdin S. V., Dimova T. V., Drozdetsky A. A., Druzhinin V. P., Ganyushin D. I., Golubev V. B., Ivanchenko V. N., Koop I. A., Korol A. A., Koshuba S. V., Otboev A. V., Pakhtusova E. V., Salnikov A. A., Shary V. V., Serednyakov S. I., Shatunov Yu M., Sidorov V. A., Silagadze Z. K., Skripkin A. G., Valishev A. A., Vasiljev A. V., Velikzhanin Yu S.

The η→π0γγ decay was investigated by the SND detector at VEPP-2M e+e- collider in the reaction e+e-→φ→ηγ. Here we present the results and some details of this study. We report an upper limit (90% c.l.) Br(η→π0γγ)<8.4×10-4 as our final result. Our upper limit does not contradict the earlier measurement by GAMS spectrometer. To facilitate future studies a rather detailed review of the problem is also given. © 2001 Elsevier Science B.V.