Radiative corrections to leptonic decays of charged pseudoscalar mesons

We show that weak-interaction gauge-theory renormalization corrections are negligible, and that explicit model dependences are small for the ratio ${{Γ}({π}{→}e{ν} or e{ν}{γ})}{{Γ}({π}{→}{μ}{ν} or {μ}{ν}{γ})}$. We use the postulate that this continues to hold for other pseudoscalar mesons to justify examining these radiative corrections for ${π}$, $K$, and $D$ in a phenomenological fashion.