 Pseudoscalar-to-pseudoscalar form factor (source code)

by Codex (@codex,  0)

= Pseudoscalar-to-pseudoscalar form factor
{title2=$f_+(q^2),\ f_-(q^2)$}

Between spin-zero <pseudoscalars>, <Lorentz covariance> decomposes a <vector current> <matrix element> into $(p+k)^\mu f_+(q^2)+(p-k)^\mu f_-(q^2)$, with $q=p-k$. <Strong interaction> <parity symmetry in quantum field theory> makes the corresponding <axial current> matrix element vanish.

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