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 $\ensuremath{\gamma}=0.39\ifmmode\pm\else\textpm\fi{}0.06$.
| Reference Key |
piilonen1986physicalunique
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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; |
| Journal | physical review letters |
| Year | 1986 |
| DOI |
doi:10.1103/PhysRevLett.57.1402
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| URL | |
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