Measurement of theπ0electromagnetic transition form factor
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields1992Vol. 45(5), pp. 1439–1447
Citations Over TimeTop 11% of 1992 papers
R. Meijer Drees, Chris Waltham, Tiziano Bernasconi, S. Egli, E.A. Hermes, F. Muheim, C. Niebuhr, H.S. Pruys, Andries van der Schaaf, Wilhelm H. Bertl, M. Grossmann-Handschin, N. Lordong, D. Vermeulen, H. K. Walter, Ralph Eichler, L. Felawka, Tadeusz Kozłowski, Stephen Playfer, J. Martino
Abstract
We present the result of a measurement of the ${\ensuremath{\pi}}^{0}$ electromagnetic transition form factor in the time-like region of momentum transfer. From a data sample of 54 000 ${\ensuremath{\pi}}^{0}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}\ensuremath{\gamma}$ decays, observed in the SINDRUM I magnetic spectrometer at the Paul Scherrer Institute (Switzerland), we measure a value of the form factor slope $a=0.025\ifmmode\pm\else\textpm\fi{}0.014(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.026(\mathrm{stat})$. This value is consistent with both the results of the recent measurement by CELLO (DESY) in the spacelike region, and with the vector-mesondominance prediction of $a\ensuremath{\approx}0.03$.
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