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The masses of the $D^\ast_{s0}(2317)$ and $D_{s1}(2460)$ resonances lie belowthe $DK$ and $D^\ast K$ thresholds respectively, which contradicts thepredictions of naive quark models and points out to non-negligible effects ofthe $D^{(\ast)}K$ loops in the dynamics of the even-parity scalar ($J^\pi=0^+$)and axial-vector ($J^\pi=1^+$) $c\bar s$ systems. Recent lattice QCD studies,incorporating the effects of the $D^{(\ast)}K$ channels, analyzed thesespin-parity sectors and correctly described the$D^\ast_{s0}(2317)-D_{s1}(2460)$ mass splitting. Motivated by such works, westudy the structure of the $D_{s0}^\ast(2317)$ and $D_{s1}(2460)$ resonances inthe framework of an effective field theory consistent with heavy quark spinsymmetry, and that incorporates the interplay between $D^{(\ast)}K$ meson-mesondegrees of freedom and bare P-wave $c\bar s$ states predicted by constituentquark models. We extend the scheme to finite volumes and fit the strength ofthe coupling between both types of degrees of freedom to the available latticelevels, which we successfully describe. We finally estimate the size of the$D^{(\ast)}K$ two-meson components in the $D^\ast_{s0}(2317)$ and$D_{s1}(2460)$ resonances, and we conclude that these states have apredominantly hadronic-molecular structure, and that it should not be tried toaccommodate these mesons within $c\bar{s}$ constituent quark model patterns.

Contribution of constituent quark model $c\bar{s}$ states to the dynamics of the $D^\ast_{s0}(2317)$ and $D_{s1}(2460)$ resonances