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I report on a lattice computation of the energy of a system of two lightquarks and two static antiquarks as a function of the separation of the staticantiquarks. In terms of hadrons such a system corresponds to a pair of B mesonsand its energy to the hadronic potential. I present selected results fordifferent isospin, spin and parity combinations of the individual B mesonsmainly focusing on those channels relevant to determine, whether two B mesonsmay form a bound tetraquark state.

Static-static-light-light tetraquarks in lattice QCD