What question did this study set out to answer?

To analyze the decay process of ∅→ηπ^0 γ and determine the branching ratio for specific decay channels.

March 5, 2026Open Access

Study of the Decay ∅→ηπ⁰ γ with the KLOE Detector

Key Points

To analyze the decay process of ∅→ηπ^0 γ and determine the branching ratio for specific decay channels.
Analyzed a sample of 5.3x10^7 ∅-decays using the KLOE detector.
Counted occurrences of ηπ^0γ events with η decaying to γγ and π^0γ events with η decaying to π+π-π0.
Performed a fit to the ηπ^0 mass spectrum to extract branching ratios.
Identified 605 ηπ^0γ and 197 π^0γ events.
Found branching ratio BR(∅→ηa_0(980)γ) as (7.4±0.7)x10^{-5}.
Dominance of the decay process ∅→a_0γ was confirmed.

Abstract

In a sample of 5. 3x10⁷ ∅-decays observed with the KLOE detector at the Frascati ∅-factory DAF∅NE we find 605 ηπ⁰γ events with η→γγ and 197 π⁰γ events with η→π^+π^-π⁰. The decay ηπ⁰γ is dominated by the process ∅→a₀γ. From a fit to the ηπ⁰ mass spectrum we find BR (∅→ηa₀ (980) γ) = (7. 4±0. 7) x10^-5.

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