First Observation of PHI(1020)--->PI0+PI0+GAMMA Decay
M.N.Achasov, V.M.Aulchenko, A.V.Berdyugin, A.V.Bozhenok, A.D.Bukin,, 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, I.A.Koop, A.A.Korol, S.V.Koshuba,, E.V.Pakhtusova, E.A.Perevedentsev, A.A.Salnikov
TL;DR
This paper reports the first observation of the decay of phi(1020) into two neutral pions and a gamma photon, measuring its branching ratio and analyzing the decay mechanism.
Contribution
It provides the first experimental measurement of the phi(1020) decay into pi0 pi0 gamma and supports the 4-quark model for F0(980) resonance.
Findings
Branching ratio measured as (1.14+-0.10+-0.12)x10^{-4}
F0(980) gamma mechanism dominates in this decay
Data supports the 4-quark model of F0(980)
Abstract
In the SND experiment at the VEPP-2M electron-positron collider the PHI(1020)--->PI0+PI0+GAMMA decay was studied. The branching ratio B(PHI--->PI0+PI0+GAMMA)=(1.14+-0.10+-0.12)x10^{-4} was measured. It was shown, that the F0(980)GAMMA mechanism dominates in this decay and the 4-quark model of F0(980) describes our data most consistently.
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