0 v 1 5 J un 2 00 2 Measurement of Γ ( φ → η ′ γ ) / Γ ( φ → ηγ ) and the pseudoscalar mixing angle

Abstract

We have measured the radiative decays φ → ηγ , φ → ηγ selecting π+ π γ γ γ final state in a sample of ∼5×107 φ-mesons produced at the Frascati φ–factory DAΦNE. We obtain Γ(φ → ηγ )/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 → ηγ ) = (6.10 ± 0.61 ± 0.43) × 10−5 and the mixing angle of… (More)

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