Steiner-tree confinement and tetraquarks

Abstract

The 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 Polonica