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The recently discovered charmed-strangemeson Ds0*(2317) has been speculatedto be a tetraquark mesonium. We study this suggestion with overlap fermions on2+1 flavor domain wall fermion configurations. We use 4-quark interpolatingoperatorswith Z4 grid sources on two lattices (16\times16\times16\times32 and24\times24\times24 times64) to study the volume dependence of the states in anattempt to discern the nature of the states in the four-quark correlator to seeif they are all two-meson scattering states or if one is a tetraquark mesonium.We also use the hybrid boundary condition method for this purpose which isdesigned to lift the two-meson states in energy while leaving the tetraquarkmesonium unchanged. We find that the volume method is not effective in thepresent case due to the fact that the scattering states spectrum is closelypacked for such heavy states so that one cannot separate out individualscattering states since the volume dependence is skewed as a result. However,the hybrid boundary condition method works and we found that the four-quarkcorrelators can be fitted with a tower of two-meson scattering states. Weconclude that we do not see a tetraquark mesonium in the Ds0*(2317) mesonregion.

Study of the scalar charmed-strange meson Ds0*(2317) with chiral fermions