Evidence of the PHI(1020)--->ETA+PI0+GAMMA Decay
M.N.Achasov, V.M.Aulchenko, S.E.Baru, A.V.Berdyugin, A.V.Bozhenok, A.D.Bukin, D.A.Bukin, S.V.Burdin, T.V.Dimova, S.I.Dolinski, V.P.Druzhinin,, M.S.Dubrovin, I.A.Gaponenko, V.B.Golubev, V.N.Ivanchenko, P.M.Ivanov,, A.A.Korol, S.V.Koshuba, A.P.Lysenko, E.V.Pakhtusova, A.A.Salnikov
TL;DR
This paper reports the observation of a rare decay of the phi meson into eta, pi0, and gamma, with a measured branching ratio based on data from the SND experiment at VEPP-2M.
Contribution
First experimental evidence of the PHI--->ETA+PI0+GAMMA decay with quantitative measurement of its branching ratio.
Findings
Branching ratio measured as (0.83+-0.23)x10^{-4}
Observation based on 8 million phi mesons
Supports theoretical predictions of rare meson decays
Abstract
Signal of the rare radiative decay PHI--->ETA+PI0+GAMMA was observed in the SND experiment at VEPP-2M electron-positron collider.The result is based on the analysis of data, corresponding to a total integrated luminosity of 4 pb^{-1}, or 8x10^6 PHI mesons produced. The measured branching ratio of PHI--->ETA+PI0+GAMMA decay is equal to (0.83+-0.23)x10^{-4}.
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