Observation of the decay PHI(1020)--->OMEGA+PI0
M.N.Achasov, S.E.Baru, A.V.Berdyugin, A.V.Bozhenok, D.A.Bukin,, S.V.Burdin, T.V.Dimova, S.I.Dolinsky, V.P.Druzhinin, M.S.Dubrovin,, I.A.Gaponenko, V.B.Golubev, V.N.Ivanchenko, A.A.Korol, M.S.Korostelev,, S.V.Koshuba, E.V.Pakhtusova, A.A.Polunin, E.E.Pyata, A.A.Salnikov
TL;DR
This study reports the first observation of the decay phi(1020) to omega+pi0, measuring its branching ratio and decay amplitude through interference patterns in e+e- collision data.
Contribution
First experimental observation and measurement of the phi(1020) to omega+pi0 decay, including its branching ratio and decay amplitude.
Findings
Branching ratio B(phi to omega+pi0) = (4.8+1.9-1.7+-0.8) x 10^{-5}
Interference pattern consistent with decay observation
Measured real and imaginary parts of decay amplitude
Abstract
The reaction e^+e^- ---> OMEGA+PI0 ---> PI+PI- 2PI0 has been studied with SND detector at VEPP-2M e^+e^- collider in the vicinity of the PHI(1020) meson resonance. The observed interference pattern in the energy dependence of the cross section is consistent with existence of the decay PHI ---> OMEGA+PI0 with a branching ratio of B(PHI ---> OMEGA+PI0)=(4.8+1.9-1.7+-0.8)x10^{-5}. The real and imaginary parts of the decay amplitude were measured. The PHI ---> OMEGA+PI0 decay was observed for the first time.
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