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We search for possibly existent bound states in the heavy-light tetraquarkchannels 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 severalgauge link ensembles with $ N_f=2+1 $ flavours of domain-wall fermions andconsider a basis of local and non-local interpolators. Besides extracting theenergy spectrum from the correlation matrices, we also perform a L\"uscheranalysis to extrapolate our results to infinite volume.

Investigation of Doubly Heavy Tetraquark Systems using Lattice QCD