Observation of the Decays ⁰⁰ and ⁰
in the SND Experiment at VEPP-2M*

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

Budker Institute of Nuclear Physics, Siberian Division, Russian Academy of Sciences,
pr. Akademika Lavrentieva 11, Novosibirsk, 630090 Russia

Received July 30, 1998

Abstract—Preliminary data on the processes e⁺e (1020) ⁰⁰, ⁰ studied in the SND experi-
ment at VEPP-2M collider in Novosibirsk are presented. The branching ratios for the rare radiative ⁰⁰
and ⁰ decays have been measured to be Br( ⁰⁰) = (1.1 0.2) 10⁴ (M > 800 MeV) and
Br( ⁰) = (1.3 0.5) 10⁴.

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