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Measurement of the π⁰ electromagnetic transition form factor Drees, Reena Meijer


We present the result of a measurement of the π⁰ electromagnetic transition form factor in the time-like region of momentum transfer. From a data sample of roughly 100,000 π⁰ → e⁺ e⁻ γ decays, observed in the SINDRUM I magnetic spectrometer at the Paul Scherrer Institute (Switzerland), we measure a value of the form factor slope a = 0.02 ± 0.01 (stat) ± 0.02 (sys). This measurement is consistent with both the results of the recent measurement by CELLO (DESY) in the space-like region, and with the vector meson dominance prediction of a ≈ 0.03.

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