Investigation of Doubly Heavy Tetraquark Systems using Lattice QCD

We search for possibly existent bound states in the heavy-light tetraquark channels with quark content $\bar{b}\bar{b}ud$, $\bar{b}\bar{b}us$ and $\bar{b}\bar{c}ud$ using lattice QCD. We carry out calculations on several gauge link ensembles with $N_f=2+1$ flavours of domain-wall fermions and consider a basis of local and non-local interpolators. Besides extracting the energy spectrum from the correlation matrices, we also perform a Lüscher analysis to extrapolate our results to infinite volume.

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