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have added more actual content and details to the entry.
In particular, I made explicit the Lagrangian densities corresponding to the Dalitz decay Feynman amplitudes:
$\mathbf{L}_{rad} \;\sim\; d A \wedge d \pi^0 \wedge (\overline{L} \!\cdot\!\gamma_\mu \!\cdot\! L) d x^\mu$for the radiative pion Dalitz decay, and
$\mathbf{L}_{sem} \;\sim\; d V \wedge d P \wedge (\overline{L} \!\cdot\!\gamma_\mu \!\cdot\! L) d x^\mu$for the semileptonic Dalitz decay of a vector meson $V$ to a pseudoscalar $P$.
This is immediate enough, but none of the reference that I find ever bother to speak in terms of Lagrangian densities, they all just write Feynman amplitudes.
added pointer to today’s
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