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In this paper we extend our analyses of the decay constant and distributionamplitude with an improved holographic wavefunction to the heavy-lightpseudoscalar mesons. In the evaluations, the helicity-dependence of theholographic wavefunction is considered; and an independent mass scale parameteris employed to moderate the strong suppression induced by the heavy quark.Under the constraints from decay constants and masses of pseudoscalar mesons,the $\chi^2$-analyses for the holographic parameters exhibit a roughconsistence with the results obtained by fitting the Regge trajectory. With thefitted parameters, the results for the decay constants and distributionamplitudes are presented. We then show their application in evaluating the$B_{d,s}\to D_{d,s}P$ decays, in which the power-suppressed spectatorscattering and weak annihilation corrections are first estimated. Numerically,the spectator scattering and weak annihilation corrections present a negativeshift of about $ 0.7\%$ on the branching fractions; while, the predictions arestill larger than the experimental data. Such small negative shift confirms theestimation based on the power counting rules.

Application of the light-front holographic wavefunction for heavy-light pseudoscalar meson in $B_{d,s}\to D_{d,s}P$ decays