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.

arXiv comment12 pages, 7 figures; Revised version accepted for publication in Physics Letters B

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