2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/230359The linear confinement in quarkonium is generalised as a minimal tree, with interesting geometrical properties. This model binds tetraquarks more easily than the additive model used in earlier investigations.6 pages, 1 fig., Contr. "Excited QCD", Zakopane, Poland, Proc. to be published in Acta Physica PolonicaHigh Energy Physics - Phenomenologytext