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Aloisio, A; Ambrosino, F; Antonelli, A; Antonelli, M; Bacci, C; Bencivenni, G; Bertolucci, S; Bini, C; Bloise, C; Bocci, V; Bossi, F; Branchini, P; Bulychjov, S.A; Caloi, R; Campana, P; Capon, G; Carboni, G; Casarsa, M; Casavola, V; Cataldi, G; Ceradini, F; Cervelli, F; Cevenini, F; Chiefari, G; Conetti, S; De Lucia, E; De Robertis, G; De Simone, P; De Zorzi, G; Dell'Agnello, S; Denig, A; Di Domenico, A; Di Donato, C; Di Falco, S; Doria, A; Dreucci, M; Erriquez, O; Felici, G; Ferrer, M.L; Finocchiaro, G; Forti, C; Franceschi, A; Franzini, P; Gatti, C; Gauzzi, P; Gorini, E; Grancagnolo, F; Graziani, E; Han, S.W; Incagli, M; Ingrosso, L; Kluge, W; Kuo, C; Kulikov, V; Lacava, F; Lanfranchi, G; Leone, D; Lu, F; Martemianov, M; Merola, L; Messi, R; Miscetti, S; Moulson, M; Müller, S; Murtas, F; Napolitano, M; Nedosekin, A; Nguyen, F; Palutan, M; Paoluzi, L; Pasqualucci, E; Passalacqua, L; Passeri, A; Patera, V; Petrolo, E; Pirozzi, G; Pistillo, C; Pontecorvo, L; Primavera, M; Ruggieri, F; Santangelo, P; Santovetti, E; Saracino, G; Schamberger, R.D; Sciascia, B; Sciubba, A; Scuri, F; Sfiligoi, I; Spadaro, T; Spiriti, E; Tong, G.L; Tortora, L; Valente, E; Valente, P; Valeriani, B; Venanzoni, G; Veneziano, S; Ventura, A; Xu, Y; Yu, Y
Physics letters. B, 08/2002, Volume: 541, Issue: 1Journal Article
We have measured the radiative decays φ→ ηγ, φ→ η′ γ selecting π + π − γγγ final state in a sample of ∼5×10 7 φ-mesons produced at the Frascati φ-factory DA ΦNE. We obtain Γ( φ→ η′ γ)/ Γ( φ→ ηγ)=(4.70±0.47±0.31)×10 −3. From this result we derive new accurate values for the branching ratio BR( φ→ η′ γ)=(6.10±0.61±0.43)×10 −5 and the mixing angle of pseudoscalar mesons in the flavour basis ϕ P =(41.8 +1.9 −1.6)°.
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