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Main Authors: Babusci, D., Beltrame, P., Berlowski, M., Bloise, C., Bossi, F., Branchini, P., Cao, B., Ceradini, F., Ciambrone, P., Cotrozzi, L., Curciarello, F., Czerwiński, E., D'Agostini, G., D'Amico, R., Danè, E., De Leo, V., De Lucia, E., De Santis, A., De Simone, P., Di Domenico, A., Diociaiuti, E., Domenici, D., D'Uffizi, A., Fantini, G., Fiore, S., Gajos, A., Gamrat, S., Gauzzi, P., Giovannella, S., Graziani, E., Ignatov, F., Kang, X., Kupsc, A., Mandaglio, G., Martini, M., Miscetti, S., Moskal, P., Passeri, A., Patera, V., del Rio, E. Perez, Punzi, L., Sborzacchi, F., Schioppa, M., Selce, A., Silarski, M., Sirghi, F., Solodov, E. P., Teubner, T., Venanzoni, G., Vestergaard, N., Wiślicki, W., Wolke, M., Zaid, E.
Format: Preprint
Published: 2025
Subjects:
High Energy Physics - Experiment
Online Access:https://arxiv.org/abs/2505.09285
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Table of Contents:
  • We present a measurement of the radiative decay $η\toπ^0γγ$ using 82 million $η$ mesons produced in $e^+e^-\toϕ\toηγ$ process at the Frascati $ϕ$-factory DA$Φ$NE. From the data analysis $1246\pm133$ signal events are observed. By normalising the signal to the well-known $η\to3π^0$ decay the branching fraction ${\cal B}(η\toπ^0γγ)$ is measured to be $(0.98\pm 0.11_\text{stat}\pm 0.14_\text{syst})\times10^{-4}$. This result agrees with a preliminary KLOE measurement, but is twice smaller than the present world average. Results for $dΓ(η\toπ^0γγ)/dM^2(γγ)$ are also presented and compared with latest theory predictions.

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