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
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.