Measurement of η→π⁰γγ branching fraction with the KLOE detector

2025/05/14 by Babusci, D., Beltrame, P., Berlowski, M. +50 · 1 citation
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2505.09285

Abstract

We present a measurement of the radiative decay η→π⁰γγ using 82 million η mesons produced in e⁺e^-→ϕ→ηγ process at the Frascati ϕ-factory DAΦNE. From the data analysis 1246±133 signal events are observed. By normalising the signal to the well-known η→3π⁰ decay the branching fraction \cal B(η→π⁰γγ) is measured to be (0.98± 0.11_stat± 0.14_syst)×10^-4. This result agrees with a preliminary KLOE measurement, but is twice smaller than the present world average. Results for dΓ(η→π⁰γγ)/dM²(γγ) are also presented and compared with latest theory predictions.

Citations

• TMVA - Toolkit for Multivariate Data Analysis
• Systematic Errors: facts and fictions
• Review of Particle Physics

Cited by

• Production-Dependent Interpretation of the KLOE--MAMI η → π⁰γγ Tension via the Nucleon-Triggered Leptophobic Vector V _{\mathcal B}

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