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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 1999, vol. 449, p. 122-127

Observation of the decay φ → ωπ0

Achasov M. N., Baru S. E., Berdyugin A. V., Bozhenok A. V., Bukin D. A., Burdin S. V., Dimova T. V., Dolinsky S. I., Druzhinin V. P., Dubrovin M. S., Gaponenko I. A., Golubev V. B., Ivanchenko V. N., Korol A. A., Korostelev M. S., Koshuba S. V., Pakhtusova E. V., Polunin A. A., Pyata E. E., Salnikov A. A., Shary V. V., Serednyakov S. I., Shatunov Yu M., Sidorov V. A., Skrinsky A. N., Silagadze Z. K., Velikzhanin Yu S.

The reaction e+ e- → ωπ0 → π+ π- π0π0 has been studied with SND detector at VEPP-2M e+e- collider in the vicinity of the φ meson resonance. The observed interference pattern in the energy dependence of the cross section is consistent with existence of the decay φ → ωπ0 with a branching ratio of B(φ → ωπ0) = (4.8-1.7 +1.9 ± 0.8) × 10-5. The real and imaginary parts of the decay amplitude were measured. The φ → ωπ0 decay was observed for the first time. © 1999 Published by Elsevier Science B.V. All rights reserved.