Lattice QCD static potentials of the meson-meson and tetraquark systems computed with both quenched and full QCD

Understand

We revisit the static potential for the $Q Q \bar Q \bar Q$ system using SU(3) lattice simulations, studying both the colour singlets groundstate and first excited state.

• We consider geometries where the two static quarks and the two anti-quarks are at the corners of rectangles of different sizes.
• We analyse the transition between a tetraquark system and a two meson system with a two by two correlator matrix.
• We compare the potentials computed with quenched QCD and with dynamical quarks.