Abstract
The ratio \(\mathcal{B}= \Gamma(\pi^0 \to{} e^+ e^- \gamma)/\Gamma(\pi^0 \to\gamma\gamma)\) is measured by comparing the production rates of the π0 in the two decay channels. The analysis is based on approximately four million hadronic decays of the Z boson recorded by the ALEPH detector in the years 1991 to 1995. The value of \(\mathcal{B}\) is determined to be \((1.140 \pm0.041)\%\). A recalculation of the Particle Data Group world average gives rise to a slightly improved error, and moves the world average closer to the theoretical value.
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Open Access This is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License ( https://creativecommons.org/licenses/by-nc/2.0 ), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
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Beddall, A., Beddall, A. Measurement of the Dalitz-decay branching ratio of the π0 . Eur. Phys. J. C 54, 365–370 (2008). https://doi.org/10.1140/epjc/s10052-008-0539-0
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DOI: https://doi.org/10.1140/epjc/s10052-008-0539-0