Study of the a0(980) meson via the radiative decay ϕ→ηπ0γ with the KLOE detector
Physics Letters B(2009)
摘要
We have studied the ϕ→a0(980)γ process with the KLOE detector at the Frascati ϕ-factory DAΦNE by detecting the ϕ→ηπ0γ decays in the final states with η→γγ and η→π+π−π0. We have measured the branching ratios for both final states: Br(ϕ→ηπ0γ)=(7.01±0.10±0.20)×10−5 and (7.12±0.13±0.22)×10−5, respectively. We have also extracted the a0(980) mass and its couplings to ηπ0, K+K−, and to the ϕ meson from the fit of the ηπ0 invariant mass distributions using different phenomenological models.
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关键词
12.39.Mk,13.20.Jf,13.66.Bc,14.40.Cs
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