2012/06/30 by Walter Heupel, Gernot Eichmann, Christian S. Fischer · 1 citation
Physics and Astronomy · #hep-ex #hep-lat #hep-ph
paper · pdf · doi:10.1016/j.physletb.2012.11.009
4 pages, 2 figures, Refs added, Typos corrected, version accepted by PLB
arxiv created 2012/11/08 · arxiv updated 2015/06/05
We determine the mass of tetraquark bound states from a coupled system of covariant Bethe-Salpeter equations. Similar in spirit to the quark-diquark model of the nucleon, we approximate the full four-body equation for the tetraquark by a coupled set of two-body equations with meson and diquark constituents. These are calculated from their quark and gluon substructure using a phenomenologically well-established quark-gluon interaction. For the lightest scalar tetraquark we find a mass of the order of 400 MeV and a wave function dominated by the pion-pion constituents. Both results are in agreement with a meson molecule picture for the f0(600). Our results furthermore suggest the presence of a potentially narrow all-charm tetraquark in the mass region 5-6 GeV.