Unique Determination of the Form-Factor Ratio in Radiative Pion Decay

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ID: 274531
1986
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Abstract
A new experiment studying radiative pion decay, ${\ensuremath{\pi}}^{+}\ensuremath{\rightarrow}{e}^{+}{\ensuremath{\nu}}_{e}\ensuremath{\gamma}$ has been performed with the Crystal Box detector at the Clinton P. Anderson Meson Physics Facility (LAMPF). From a maximum-likelihood analysis of the Dalitz-plot distribution of 2364 coincident and random events, we obtain a unique value for $\ensuremath{\gamma}$, the ratio of the axial-vector to vector weak pion form factors, of 0.25 \ifmmode\pm\else\textpm\fi{} 0.12. The new world average is $\ensuremath{\gamma}=0.39\ifmmode\pm\else\textpm\fi{}0.06$.
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Authors L. E. Piilonen, R. D. Bolton, M. D. Cooper, J. S. Frank, A. L. Hallin, P. Heusi, G. E. Hogan, C. M. Hoffman, F. G. Mariam, R. E. Mischke, V. D. Sandberg, R. A. Williams, S. L. Wilson, V. L. Highland, J. McDonough, D. Grosnick, S. C. Wright, M. Ritter
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Journal physical review letters
Year 1986
DOI
doi:10.1103/PhysRevLett.57.1402
URL
https://doi.org/10.1103/physrevlett.57.1402
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