What question did this study set out to answer?

This research aims to measure the branching ratio of the decay Φ → π^0 π^0 γ.

March 5, 2026Open Access

Study of the Decay Φ → π⁰ π⁰ γ with the KLOE Detector

Key Points

This research aims to measure the branching ratio of the decay Φ → π^0 π^0 γ.
Utilized the KLOE detector for data collection
Analyzed a sample of approximately 5x10^7 Φ decays
Employed fitting models for two-pion mass spectrum
Measured branching ratio BR(Φ → π^0 π^0 γ) = (1.09 ± 0.03(stat) ± 0.05(syst))x10^-4
Disentangled contributions from various sources in the two-pion mass spectrum

Abstract

We have measured the branching ratio BR (Φ → π⁰ π⁰ γ) with the KLOE detector using a sample of ~5x10⁷Φ decays. Φ mesons are produced at DAFNE, the Frascati Φ-factory. We find BR (Φ → π⁰ π⁰ γ) = (1. 09 ± 0. 03 (stat) ± 0. 05 (syst) ) x10^-4. We fit the two--pion mass spectrum to models to disentangle contributions from various sources.

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