The QCD non-perturbative contribution to the axial form factor in radiative pion decay

@article{Nasrallah1982TheQN,
  title={The QCD non-perturbative contribution to the axial form factor in radiative pion decay},
  author={Nasrallah F. Nasrallah and Nikolaos A. Papadopoulos and Karl Schilcher},
  journal={Physics Letters B},
  year={1982},
  volume={113},
  pages={61-64}
}
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A new measurement of the elastic scattering of 250-GeV/c negative pions by electrons provides form-factor results from 0.0368 = 0.439 +- 0.030 fm/sup 2/ or /sup 1/2/ = 0.663 +- 0.023 fm. Comparisons
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We have measured the electromagnetic form factor of the charged pion by direct scattering of 100-GeV/c ..pi../sup -/ from stationary electrons in a liquid-hydrogen target at Fermilab. The deviations
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Two sum rules are derived, relating moments of the spectral functions of the vector and axial-vector currents. If it is assumed that the $\ensuremath{\rho}$ and $A1$ mesons dominate these moments,
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The branching ratio for the decay $\ensuremath{\pi}\ensuremath{\rightarrow}e\ensuremath{\nu}\ensuremath{\gamma}$ has been measured in a counter experiment in which the ${e}^{+}$ was detected in a