Study of the φ decays into π0π0γ and ηπ0γ final states

• DOI: 10.1016/s0370-2693(99)00920-x
• Publication Date: 2002-07-25T09:18:58Z
• Authors: R.R. Akhmetshin; E.V. Anashkin; M. Arpagaus; V.M. Aulchenko; V.S. Banzarov; L.M. Barkov; N.S. Bashtovoy; A.E. Bondar; D.V. Bondarev; A.V. Bragin; D.V. Chernyak; A.S. Dvoretsky; S.I. Eidelman; G.V. Fedotovich; N.I. Gabyshev; A.A. Grebeniuk; D.N. Grigoriev; P.M. Ivanov; S.V. Karpov; V.F. Kazanin; B.I. Khazin; I.A. Koop; P.P. Krokovny; L.M. Kurdadze; A.S. Kuzmin; I.B. Logashenko; P.A. Lukin; A.P. Lysenko; K.Yu. Mikhailov; I.N. Nesterenko; V.S. Okhapkin; E.A. Perevedentsev; E.A. Panich; A.S. Popov; T.A. Purlatz; N.I. Root; A.A. Ruban; N.M. Ryskulov; A.G. Shamov; Yu.M. Shatunov; B.A. Shwartz; A.L. Sibidanov; V.A. Sidorov; A.N. Skrinsky; V.P. Smakhtin; I.G. Snopkov; E.P. Solodov; P.Yu. Stepanov; A.I. Sukhanov; V.M. Titov; Yu.V. Yudin; S.G. Zverev; J.A. Thompson
• Keywords: Branching fraction; Systematic error

Abstract Radiative decays of the φ meson have been studied using a data sample of about 19 million φ decays collected by the CMD-2 detector at VEPP-2M collider in Novosibirsk. From selected e+e−→π0π0γ and e+e−→ηπ0γ events the following model independent results have been obtained: Br(φ→π0π0γ)=(0.92±0.08±0.06)×10−4 for Mπ0π0>700 MeV, Br(φ→ηπ0γ)=(0.90±0.24±0.10)×10−4. It is shown that the intermediate mechanism f0(980)γ dominates in the φ→π0π0γ decay and the corresponding branching ratio is Br(φ→f0(980)γ)=(2.90±0.21±1.54)×10−4. The systematic error is dominated by the possible model uncertainty. Using the same data sample the upper limit has been obtained for the P- and CP-violating decay of η at 90% CL: Br(η→π0π0)