  We study the case of a di-bottomonium $bb\bar b\bar b$ particle at the LHC.
Its mass and decay width are obtained within a new model of diquark-antidiquark
interactions in tetraquarks. The same model solves several open problems on the
phenomenology of the experimentally better known $X,Z$ states. We show that the
$bb\bar b\bar b$ tetraquark is expected approximately 100 MeV below threshold,
and compare to a recent analysis by LHCb seeking it in the $\Upsilon\mu\mu$
final state.
