TY - JOUR
T1 - Radiative pion decay: Determination of FA(0) from τ-lepton decay data
AU - Dominguez, C. A.
AU - Solà, J.
PY - 1988/7/7
Y1 - 1988/7/7
N2 - The form factor FA(0) in π→eνγ is calculated, at the soft pion point, directly from data on the semileptonic τ-lepton decays τ→ντ + nπ, which determine the relevant vector and axial-vector hadronic spectral functions. The reliability of this calculation is assessed by using these fitted spectral functions to check the saturation of the first two Weinberg sum rules. The results are: FA(0)=0.017±0.004, and γ(0)FA(0)/FV(0)=0.67±0.04±0.16. © 1988.
AB - The form factor FA(0) in π→eνγ is calculated, at the soft pion point, directly from data on the semileptonic τ-lepton decays τ→ντ + nπ, which determine the relevant vector and axial-vector hadronic spectral functions. The reliability of this calculation is assessed by using these fitted spectral functions to check the saturation of the first two Weinberg sum rules. The results are: FA(0)=0.017±0.004, and γ(0)FA(0)/FV(0)=0.67±0.04±0.16. © 1988.
U2 - 10.1016/0370-2693(88)91217-8
DO - 10.1016/0370-2693(88)91217-8
M3 - Article
VL - 208
SP - 131
EP - 134
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
IS - 1
ER -