Measurement of the ${\pi }^0$ electromagnetic transition form factor slope

Abstract

The NA62 experiment collected a large sample of charged kaon decays in 2007 with a highly efficient trigger for decays into electrons. A measurement of the ${\pi }^0$ electromagnetic transition form factor slope parameter from $1.11\times 10^6$ fully reconstructed $K^{\pm }\to {\pi }^{\pm }{\pi }_D^0,{\pi }_D^0\to e^{+}{e}^{-}\gamma$ events is reported. The measured value $a=(3.68\pm 0.57)\times 10^{-2}$ is in good agreement with theoretical expectations and previous measurements, and represents the most precise experimental determination of the slope in the time-like momentum transfer region.

12 pages, 7 figures; Revised version accepted for publication in Physics Letters B

References in corpus (5)

• Dispersive analysis of the pion transition form factor
• Search for direct CP violating charge asymmetries in $K^{\pm }\to {\pi }^{\pm }{\pi }^{+}{\pi }^{-}$ and $K^{\pm }\to {\pi }^{\pm }{\pi }^0{\pi }^0$ decays
• Rare decay ${\pi }^0\to e^{+}{e}^{-}$: on corrections beyond the leading order
• Measurement of the pi^0 -> e^+e^-gamma Dalitz decay at the Mainz Microtron
• Vector meson dominance and the pi^0 transition form factor

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