Abstract
The decay π +→ e + νγ has been measured by detecting the positron with a magnetic spectrometer and the photon with an array of NaI scintillators. Using CVC to compute the vector form factor from the π 0 lifetime we use our data to determine the ratio γ of the axial-vector form factor to the vector form factor. With the best present value for the π 0 lifetime (0.897±0.022±0.017)×10 −16 s and F V=(2.55 ±0.05)×10 −2 we obtain two solutions: γ=0.52 ±0.06, favored by a likelihood ratio greater than 8.5 against γ=−2.48±0.06.
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