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We investigate the $D_{s0}^\ast(2317)$ meson using lattice QCD andconsidering correlation functions of several $\bar{c} s$ two-quark and $\bar{c}s (\bar{u} u + \bar{d} d)$ four-quark interpolating fields. These interpolatingfields generate different structures in color, spin and position spaceincluding quark-antiquark pairs, tetraquarks and two-meson scattering states.For our computation we use an ensemble simulated with pion mass $m_\pi \approx0.296 \, \textrm{GeV}$ and spatial volume of extent $2.90 \, \textrm{fm}$. Wefind in addition to the expected spectrum of two-meson scattering statesanother state around $60 \, \textrm{MeV}$ below the $D K$ threshold, which weinterpret as the $D_{s0}^\ast(2317)$ meson. This state couples predominantly toa quark-antiquark interpolating field and only weakly to a $D K$ two-mesoninterpolating field. The coupling to the tetraquark interpolating fields isessentially zero, rendering a tetraquark interpretation of the$D_{s0}^\ast(2317)$ meson rather unlikely. Moreover, we perform a scatteringanalysis using L\"uscher's method and the effective range approximation todetermine the $D_{s0}^\ast(2317)$ mass for infinite spatial volume. We findthis mass $51 \, \textrm{MeV}$ below the $D K$ threshold, rather close to bothour finite volume result and the experimentally observed value.

Tetraquark interpolating fields in a lattice QCD investigation of the $D_{s0}^\ast(2317)$ meson