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We study the $\bar{B}_s^0\to D_s^-(DK)^+$ weak decay, and look at the $DK$invariant mass distribution with the aim of obtaining relevant information onthe nature of the $D_{s0}^{\ast+}(2317)$ resonance. We make a simulation of theexperiment using the actual mass of the $D_{s0}^{\ast+}(2317)$ resonance andrecent lattice QCD relevant parameters of the $KD$ scattering amplitude. Wethen solve the inverse problem of obtaining the $KD$ amplitude from thesesynthetic data, to which we have added a 5\% or 10\% error. We prove that onecan obtain from these "data" the existence of a bound $KD$ state, the $KD$scattering length and effective range, and most importantly, the $KD$probability in the wave function of the bound state obtained, which was foundto be largely dominant from the lattice QCD results. This means that one canobtain information on the nature of the $D_{s0}^{\ast+}(2317)$ resonance fromthe implementation of this experiment, in the line of finding the structure ofresonances, which is one of the main aims in hadron spectroscopy.

$D_{s0}^{\ast\pm}(2317)$ and $KD$ scattering from $B^0_s$ decay