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arxiv: hep-ex/9807016 · v3 · submitted 1998-07-17 · ✦ hep-ex

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
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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 S.I.Serednyakov V.V.Shary Yu.M.Shatunov V.A.Sidorov Z.K.Silagadze A.N.Skrinsky Yu.V.Usov Yu.S.Velikzhanin
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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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