CLFQM calculations of D(s) to P/S/V/A form factors and branching ratios agree with data for most P and V channels but show notable discrepancies for several S and A channels.
TABLE XV: The branching ratios of the semi-leptonic decays D(s) → Aℓνℓ with A = a1, b 1, f (′) 1 , h (′) 1
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Systematic analysis of $D_{(s)}$ meson semi-leptonic decays in the covariant light-front quark model
CLFQM calculations of D(s) to P/S/V/A form factors and branching ratios agree with data for most P and V channels but show notable discrepancies for several S and A channels.